Presidium OTi

ALL IN ONE tester for natural and synthetic diamonds, simulants or moissanites

Presidium OTi das ALL IN ONE combi tester

OTi by Presidium revolutionizes diamond authentication with its dual Optical/Thermal testing in a single probe, ensuring accurate distinction between natural and synthetic diamonds. It is a quick, cost-effective tool that ensures accuracy and trust.

In the Diamond & Jewelry Industry (D&J), the OTi by Presidium emerges as an essential tool for all professional users such as jewelers, diamond wholesalers/traders, pawnbrokers, in ensuring accurate disclosure to maintain the integrity of the trade.

OTi by Presidium (OTi) enhances the authentication process by accurately distinguishing natural diamonds from synthetics, crucial in an era of increasing lab-grown diamonds and simulants. With its dual technologies of Optical/Thermal testing in a single probe, it provides a cost-effective and fast, on-the-spot validation, to optimize operational efficiency and instilled consumer confidence in your diamond verification processes.

• User-safe function to shut off UV light when not in use
• Resistive Touch Screen
• Auto Shutdown Feature
• Low Battery Indicator
• 6 Languages user interface
• Stylish ergonomic design for portability and ease of use

• Help identify colorless diamonds against CVD/HPHT lab-grown colorless diamonds, all types of moissanite and all common diamond simulants such as Glass, Sapphire and Cubic Zirconia (CZ)
• Dual technologies of Optical/Thermal in a single probe for instant results
• Test on loose and mounted diamonds in all jewelry settings
• Replaceable Probe Technology to minimize equipment downtime
• Compact and portable design for on-the-spot testing
• Test on colorless polished diamonds of all proportional cuts with a minimum gemstone's table width of 1.6mm


Unique closure with double locking.

in a minimalist design and high elegance. The Doubleclip is safe to use and immediately impresses with its quick and easy opening and closing. The innovative double locking mechanism keeps the chain reliably together at all times and gives the wearer peace of mind.

An acoustic “click” confirmation gives the user a feeling of security. The locking parts are movable and prevent the chain from twisting.

The clasp can be attached to almost any type of chain.


  • Steel ring
  • Rubber or leather by the metre

with eyelet

  • Link chains (pea, anchor or curb chains etc.)
  • pearl necklaces
  • Stone chains

Your customer will love and appreciate the nau-like clasp in everyday use.

The double clip is available in stainless steel, gold and silver and in various diameters

Click here for the new clasps

Did you already know?

Boley's extensive database for small and large clock movements and spare parts.

In our extensive calibre database you will find more than 16,000 calibres, over 4,100 movements and interchangeabilities and around 160,000 watch parts registered.

Search our extensive database for calibre information, watch movement interchangeabilities and spare parts and find the matching movement parts listed quickly and clearly.

And this is how it works:

(1) Are you looking for specific spare parts for your repair? Simply enter the calibre number in the corresponding search field and then use the magnifying glass function to select the desired movement from the list.
Tip: The fewer digits you enter, the larger the selection list. This means that even calibre numbers that are difficult to recognise can be found. Conversely, you can also enter the manufacturer and the calibre, which will reduce the selection list and increase your accuracy.

(2) In the calibre data sheet you will find extensive and detailed information about the size and functions of the movement. Many calibres also have a pictogram.

(3) When you see this button, you can call up a detailed exploded view of the movement. The document is displayed using the free Acrobat Reader.

(4) Did you know that you can find out the interchangeability of the winding stems with the help of our calibre database? Compare the part number on our packaging with that of the calibre. Often different movements have the same winding stems. Reduce and organise your own stock and save money.

(5) For quartz or solar movements, the battery number is shown here.

(6) We have archived our spare parts for you under the heading Movement Parts. Here you can find the respective prices and the availability of spare parts.
Tip: If the spare part you are looking for is marked yellow or not listed, we may still have it in stock. Please ask for availability and price via our chat button. Many of our old, in-stock spare parts are currently not yet registered in the database and are just waiting for your request!

(7) In the movements section, we offer you replacement and exchange movements for the calibre you are looking for. Prices and availability are of course immediately visible and will speed up your quotation and procurement.

Witschi WAIO

ALL IN ONE water proof test and accuracy.


Witschi WAIO, the comprehensive watch check for your salesroom. Enhance the customer experience at the point of sale with the WAIO. The sophisticated device offers comprehensive, automatic measurement of mechanical and quartz watches. The sales staff check the tightness and chronometry directly on the sales floor and carry out demagnetisation. By analysing the WAIO, you can reassure your customers that their watches are in perfect working order, or you can provide them with well-founded arguments for servicing thanks to the results displayed.

Fully automatic measurement at the touch of a button. The WAIO is ready for immediate use and requires minimal operator training thanks to its user-friendly software. The large display guides you step by step through the measurement process. The measurement results are easy to understand, especially for people without specialised technical knowledge. Thanks to the extended display of the results, the exact and detailed results are of course also visible. Witschi Data Management. Thanks to the connection to WiCoTRACE 4, all measurement results are automatically saved and can be further processed and/or shared from there.

• Fully automatic measurement of mechanical and quartz watches with and without bracelet
• High-resolution 7" display with touch function
• User-friendly operation and easy-to-understand results display
• Precise measurement thanks to the latest measurement technology and algorithms
• Leak tests up to 5 bar with the built-in air compressor
• Measurement of the rate accuracy of mechanical watches in four test positions
• Measurement of the rate accuracy and motor pulses of quartz watches
• Effective demagnetisation of the watch with determination of the rate difference
• ScratchProtect prevents scratches on the watch
• Regular updates and functional enhancements over the air (internet connection required)
• Connection to WiCoTRACE 4
• Individualised programme creation and loading of specific measurement programmes per watch (only possible with WiCoTRACE 4)

Did you already know?

leather straps

Manufacturing techniques for watch straps

What does cut strap actually mean and what are the differences to a fully remborded or semi-remborded leather strap?

What characterises a leather strap “Made in Gemany” and how many work steps are required for this?

Cut strap (approx. 70 work steps)

The cut strap is the most common, but rather simple leather strap. It consists of a three-layer material - upper leather, filling material and lining leather. The leather is cut by using a cutting tool and the edges are then varnished.

With around 70 work steps, it is somewhat more complex to produce than the semi-remborded leather strap.

Semi-remborded or semi-crowned leather strap (approx. 50 work steps)

With the semi-remborded strap, the upper leather surrounds the body of the strap and the lining leather forms the end at the bottom. In contrast to the full remborded strap, the upper leather is not covered and sewn under the lining leather. It is therefore not the seam that holds the strap together but, as with the cut strap, only the adhesive. Due to the durability is this the optimal production method as it shows no open edges.

This production method could only be implemented with modern, environmentally friendly adhesives and the only approximately 50 work steps have lead to economical consumer prices.

Remborded or full wraparound finish leather strap (approx. 100-120 work steps)

With the full remborded leather strap, the upper leather is wrapped around the filling material and sealed from the lining leather by adhesion. On the inside of the leather strap is a breathable filling material which leads to a better ventilation effect (“aero lining”). All the layers are glued with each other. A thread is only a design feature. Semi- and fully remborded leather straps combine softness - depending on the upper leather - with high stability and durability.

With approx. 100-120 work steps, it is quite complex to produce, which is why it is preferably used for high-quality bracelets.

Did you already know?

Flexbo 3.0 the innovative workbench concept

What you should know about our workbenches

Did you know that this month marks the tenth anniversary of our Flexbo workbench concept? We have been selling our workbenches to workshops and industry with great success for ten years - all over Europe! You will even find our workbenches in Buckingham Palace and the Munich Museum.

The current Flexbo 3.0 workbench concept is characterised by high functionality, great flexibility and outstanding workmanship. All workbenches are “made in Germany” and customised for watchmakers, goldsmiths and setters. A wide range of accessory options leaves almost nothing to be desired. The Flexbo workbenches are characterised by the following main features:

• Electric height adjustment, optionally with load capacity increase
• Stable, movable 3D armrests that do not wobble and can be adjusted in all directions
• all drawers with precise guide rails as well as soft-close and full-extension runners
• Professional cable routing, optionally with cable cover on the back
• Sophisticated accessory concept for storage shelves and drawer partitioning

Let our professional Flexbo 3.0 workbench concept convince you. You will find that we lead the watch and jewellery industry in terms of functionality, flexibility and quality of workmanship. We would be happy to provide you with a customised quote.

You can find our Flexbo 3.0 workbench brochure:

Boley live

Welding Workshop

Weekend seminar on 27.04. and 28.04.2024 the PUK fine welding was a complete success!

The latest fine welding technology was the topic of the ‘PUK 6’ seminar, which took place again at the premises of Gebrüder Boley after a five-year absence. In cooperation with Lampert Werktechnik, we succeeded in organising another workshop on PUK fine welding after May 2019. The participants took the opportunity to test the handling and results of the latest generation of PUK 6 devices on fine welding machines.

The 2-day seminar took place this weekend on Saturday, 27 April and Sunday, 28 April 2024 under the direction of Susanne Englert, a trained master silversmith and teacher at the “Staatliche Zeichenakademie” in Hanau.

The participants were introduced to the PUK welding technique on both days on the following welding topics:

  • Application of metals
  • Welding silver
  • Carrying out ring changes
  • Welding ear studs
  • Welding of settings
  • Fixation welding
  • Treatment of individual special applications
  • and much more.

The participants had brought their own jewellery and watch pieces with them. Mrs Englert was able to use these as examples to work out solutions to problems for all participants and thus provide important tips for everyday workshop work. The focus was also on the exchange of experiences between the participants.

The participants spoke of a very successful seminar, which will be offered again in this form by Gebrüder Boley at regular intervals. We would like to take this opportunity to thank all participants and especially Mrs Susanne Englert for her participation and commitment.

We would like to thank all seminar participants and wish them continued success.

Save the date

PUK Seminar


After five years of abstinence, we are pleased to be able to offer you a BOLEY WORKSHOP on PUK fine welding again today. In cooperation with Lampert Werktechnik, we have succeeded in organizing a workshop on PUK fine welding again after May 2019.

Under the leadership of Ms. Susanne Englert, master silversmith and, among other things, teacher at the stately drawing academy in Hanau, we offer you a weekend seminar with extensive training and exchange of experience on 27-28.04.2024 in our premises in Stuttgart-Degerloch. You will be trained on the latest devices “PUK 6” from Lampert Werktechnik and only need to bring your own jewelry and watches as practice pieces.

As a participant, you will be introduced to PUK welding technology, including the following welding topics:

• Application of metals
• Welding silver
• Making ring changes
• Welding ear studs
• Welding of settings
• Repairing metal bands
• Reconditioning of watch cases
• Treatment of your individual special applications

Please note that the number of participants is limited to 10. We therefore look forward to receiving your binding, written confirmation at or with the enclosed registration documents.

Inhorgenta 2024

Trends and highlights

That was Inhorgenta 2024, everything is packed up again and the hall doors are closed.

25,000 visitors, 870 exhibitors and 4 exciting exhibition days - INHORGENTA 2024 is now history. The trade fair organizers recorded a 5% increase in visitors, with many of the first-time visitors coming from the Czech Republic, Switzerland, China, France, the Netherlands and Norway. “This large increase in exhibitors and visitors is a great confirmation of our new concept and I am already looking forward to implementing the plans for internationalization for 2025,” says Exhibition Director Stefanie Mändlein.

We can also look back on a successful trade fair and would like to present the latest trends and highlights from our stand today. You will find detailed product descriptions in the link below.

• Powerful and easy-to-use Marking laser "JewelLiner " with suction and extensive training documentation.
• New Leica Investa 3 microscope in a complete set with GRS Acrobat Versa holder
• New presentation of testing devices for testing real and labgrown diamonds from Presidium
• Demonstration of the new high-resolution Video inspection system TEC-Scope Plus.
Easy and Gemlightbox photo studios with artificial intelligence
• Novel goldsmiths shaping tools or cutting out from Durston
• Tried and tested: fine welding device from Lampert PUK6 with microscope
• New presentation of press stamps for easy changing of RX glasses and bezels made of metal or ceramic.

50 years of Inhorgenta - and Boley was always there

This year we were also delighted to receive a special honor. In the presence of Ms. Stefanie Mändlein and Mr. Stefan Rummel, we were honored by the trade fair management for 50 years of uninterrupted participation as an exhibitor. We are delighted to receive this award and are also proud to have accompanied this trade fair as a partner over the years. We would therefore like to take this opportunity to thank you as visitors to this trade fair. Because you have also contributed to making this trade fair what it is today.

Redesigned exhibition stand

In order to be able to present our wide range of products to you even better and more clearly, we have enlarged and redesigned our stand this year. Machines and small tools awaited your expert inspection and use on the large platforms. Many visitors made extensive use of this opportunity to put our tools through their paces, pass on their opinions to us and make recommendations.

Labgrown diomonds

The Difference


Did you know that there is one important difference between natural and lab-grown diamonds? Natural diamonds can contain nitrogen atoms or aggregates. Nitrogen is one of the most common impurity elements in natural diamonds and can affect their color and properties. The presence of nitrogen can lead to a yellow or blue color in the diamond. However, there are also diamonds that are almost free of nitrogen and are therefore colorless or of high purity. However, these diamonds make up only 1.8% of all natural diamonds. The laboratory-grown diamonds are either grown under high temperature and high pressure (HTHP = high temperature - high pressure) or produced using a chemical vapor deposition process (CVD = chemical vapor deposition). The artificially produced diamonds have no nitrogen atoms or aggregates. The testing devices for laboratory-grown diamonds make use of this distinguishing feature by detecting the presence of a nitrogen atom/aggregate in the naturally grown diamonds via UV light refraction.

Procedure for testing laboratory-grown diamonds:

The technology of the testing devices for purely laboratory-grown diamonds (ARI, SDS II) is not suitable for simulants such as zirconia or cubic zirconia and in these cases returns ‘diamond’ as the result. The conventional diamond tester “Diamondmate-A” (PDMT-A)" or the “Adamas” can help here, as it can identify cubic zirconia and colourless sapphires.

1st test step:
Therefore, test the stone in question in a first test step with the “Diamondmate-A”, the “Adamas” or Multitester III to ensure that it is indeed a diamond. If the tester has identified the stone as a ‘diamond’, it means that the stone is either a natural diamond, a lab-grown diamond or a moissanite.

2nd test step:
In a second test step using a tester for lab-grown diamonds (ARI, SDS II), you can then subdivide the natural diamonds from the lab-grown diamonds and moissanites.

Click here for the gemstone testers:

Boley Inhorgenta

Partnership with Horotec

Horotec supports Gebrüder Boley at the INHORGENTA 2024 Trafe Fair.

Get 10% Disount all Horotec Tools during 29.01.2024 - 19.02.2024

Did you know that Horotec from La Chaux-de-Fonds in Switzerland, the world-renowned supplier of watchmaking and precision engineering tools, and Gebrüder Boley have been working together successfully for several decades?

And this co-operation is growing from year to year, so that Boley is currently one of Horotec's leading sales partners worldwide. Both companies co-operate regularly at trade fairs and other events. At the newly designed INHORGENTA stand of Boley in Hall C2, Horotec will be presenting the following interesting innovations, among others:

  • Universal tool for milling, drilling and deburring (Boley Art.-No. 514700)
  • Dial kit for setting the dial feet (Boley Art.-No. 514710)
  • Professional grinding tool for screwdriver blades (Boley Art.-No. 511266)

You will also benefit from 10% discount on all HOROTEC tools listed in the Horotec shop-in-shop section during 29.01.2024 - 19.02.2024. You can experience many of these tools live at the Boley stand at INHORGENTA.

In addition, Boley stocks over 300 Horotec tools online. If you cannot find a Horotec reference in our online shop, please enquire via chat or email by for the price and delivery time. We can usually get you the desired Horotec item at short notice.

Your Boley Team

Visit us!

Hall C2 Booth 302


The Inhorgenta Munich trade fair has undergone an impressive development since its beginnings. It was first launched in 1974 and has since developed into one of the world's leading trade fairs for jewelry, watches and gemstones. The fair provides a platform for exhibitors from all over the world to present their latest products and innovations and to make business contacts.

The 50th anniversary of the fair is a milestone that we are proud of. It is a sign of the continuous development and success of Inhorgenta Munich. And GEBRÜDER BOLEY is also proud of its 50 years of uninterrupted participation in this trade fair, which has accompanied us in partnership over the past years. We would like to take this opportunity to thank you, our visitors, who have contributed to making this fair what it is today.

To mark the 50th anniversary of GEBRÜDER BOLEY's participation at Inhorgenta Munich, we have not only redesigned and enlarged our stand, but we will also be presenting interesting new products and offers that we will be presenting to you in February 2024. You can already see one of the new products today with the power riveting machine of the brand "Bergeon-Star " shown here. It symbolizes the development of tools in the watchmaking trade: from the beginnings of the classic “Boley” power riveting machine in the traditional wooden box from the 1970s to the new development under the "Bergeon-Star " brand, which you will be able to see at the GEBRÜDER BOLEY stand.

We look forward to welcoming you at the upcoming Inhorgenta Munich from 16.02.-19.02.2024 at our booth no. 302 in hall C2. Let's celebrate the 50th anniversary together.

Your Boley exhibition team

Battery Rewards 2024

What reward can it be?

Take advantage of our premium Rewards battery campaign for the year 2024 and secure your personal annual bonus right now.

In the new year, you will once again have the choice between three attractive battery premiums. We have selected the battery premiums with great care and they all come from premium brand manufacturers. These are practical items for everyday use that are currently the focus of interest.

The purchase of battery packs from the ENERGIZER, MURATA/SONY and RENATA brands will follow the tried and tested pattern: spread the purchase of the packs over the entire year 2024 according to your individual requirements. The final settlement of the annual premium will then only take place at the end of 2024.

The following battery bonus are available to you in 2024:

1. Hot air fryer “Caso AF 250” for fat-reduced preparation of any food

• Prepare your food fat-free - for a crispy, even result on the outside and a juicy inside at the same time.
• Achieve perfect and fast baking results thanks to the innovative CASO airflow technology for better and more efficient heat distribution.
• Benefit from a wide range of application options: Heating, deep-frying, roasting, grilling, baking and keeping warm.
• Large frying basket with 3 liter capacity for up to 5 portions.
• Stiftung Warentest verdict, issue 6/2019 "Good (1.8)".

You will receive this bonus free of charge if you purchase 3 battery packs spread over the whole of 2024.

2. Set of 4 “MÖVE Superwuschel” terry towels in a practical gift box

• Pamper your loved ones with super soft towels, “made in Germany”.
• Four standard 50x100cm terry towels made from 100% white cotton.
• Environmentally friendly and tested for harmful substances in accordance with Oeko-Tex Standard 100.
• In gift box with window lid and all-over print of the MÖVE logo.

You will receive this bonus free of charge when you purchase 1 battery pack, spread over the whole of 2024.

3. compact wallet “Secrid Miniwallet Black” - the perfect all-rounder in a small format

• Plenty of space for up to 6 protected cards and 4 extra cards as well as banknotes and a small coin pocket.
• 4/6 cards in an aluminium card protector that protects against bending, breaking and unwanted NFC and RFID data tapping.
• With metal lever for automatic card removal
• Environmentally friendly production with a CO² impact that is 100% offset
• Smooth, black surface made from the best quality European cowhides

You will receive this bonus free of charge when you purchase 1 battery pack, spread over the whole of 2024.

Boley Workshop

Quick recap


After April 2022, BOLEY conducted the 2nd workshop on Saturday 21/10/2023. Approximately 30 interested parties attended this year's workshop, confirming BOLEY's expectations and underpinning the status of this workshop as an important event for information gathering in new technologies. Of the 30 participants, half came from a larger radius of 100 km, which underlines the supra-regional character of this event.

One of the most outstanding features of this year's event was the quality of the environment for workshop leaders and participants alike. BOLEY placed great emphasis on creating an atmosphere conducive to exchange and innovation.

This type of workshop was also praised for the high level of practical exchange between the qualified speakers. The expert discussions offered at the event were of a high standard and attracted a knowledgeable audience who were keenly interested in the topics covered on marking laser technology, CNC-controlled engraving machines, PUK fine welding technology and computer-controlled watch testing.

The quality of the exchange between participants, whether watchmaking or goldsmithing, remains the strength of the BOLEY workshop. Fruitful encounters and potential partnerships were at the heart of this year's event, a feature on which BOLEY will continue to build.

The vast majority of participants surveyed were very satisfied with the event and have already expressed their interest in the next workshop.

So we are looking forward to another exceptional workshop in April/May 2024, the exact date of which we will communicate in due time. Stay tuned and join us for an unforgettable experience in the exciting world of watch and jewellery technology.

Boley live

social media

Follow us on Instagram - experience BOLEY live!

Did you actually know that we have passed the magic mark of over 12,000 followers in “B-to-B” (among business partners), making us one of the most contacted Instagram accounts in watch and jewellery technology? And every day there are more!

If you don't want to miss the best pictures and most interesting short videos or online stories from BOLEY, then you should follow us on Instagram. Enter into dialogue with us and learn more about the news, activities and promotions from our company first-hand via photos and videos.

Give us a glimpse behind the scenes of your daily work and show us how you use tools and machines from BOLEY. To do so, tag us in your posts or online stories with or use the hashtag #myboley. We will be happy to publish your contributions in our stories.

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