+44 20 351 466 05
+49 89 1222 893 0


Jewellery production by the jewellers Franz & Maximilian Hemmerle

From minerals to sparkling gemstones

The elaborate process of producing a breathtaking piece of jewellery starts with a precious stone. Gemstones are generally minerals, formed in a complex and lengthy process far under the earth that may span millions of years. The magnificence of these unique minerals is brought out by the skill of experienced gemstone cutters and polishers. RenéSim works with gemstone dealers from all over the world to source the most desirable stones for you. Our long-standing and trust-based partnerships with the most exclusive mining and cutting companies in the world enable us to offer you the most beautiful quality gemstones currently available on the market at outstanding conditions. We are also happy to use unusual colours or special shapes or styles of cut in making your jewellery dream come true.


Diamond engagement rings by Franz Hemmerle, 2010

Engagement rings for one-carat diamonds: Diamond engagement rings in platinum
and white gold with diamonds, designed by Franz & Maximilian Hemmerle, 2010

Goldsmiths and gemstone setters

The gems are inspected thoroughly by our on-site experts and passed with confidence to our highly-qualified goldsmiths, who create the ring bands and precious items that complement the gems as the perfect setting. Highly trained gemstone setters then set the gems, a task involving special consideration of the unique features of each stone to ensure it sits perfectly and securely in the setting. All our jewellery is produced in Germany by highly professional experienced goldsmiths and setters. We guarantee that each of our exclusive pieces has been produced individually and meticulously by hand using only the finest-quality materials.

Workshop Picture 1

Workshop Picture 2

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Click on the individual workshop pictures to enlarge them.


The following topics may also interest you:

The RenéSim company, its philosophy and origins of the name
The vision of the two founders Maximilian Hemmerle & Georg Schmidt-Sailer
The history of Franz & Maximilian Hemmerle and René Sim Lacaze
The unique "New European Art Déco" style: Designs by Franz & Maximilian Hemmerle
The exclusive RenéSim service: All jewellery can be personalised

You may also be interested in the following:

If diamonds or diamond jewellery such as rings are your interest, our Diamonds section supplies the information you need.

Use filter settings to search for specific diamonds in our diamond database with up to 250,000 stones: Purchasing Diamonds.

If you seek an engagement ring, we recommend taking a look at our quality prêt-à-porter engagement rings.

Are you considering a gift of jewellery? Here are some attractive ideas: Stylish jewellery gifts.

About RenéSim Service Ring Sizes Newsletter Press Jobs Terms and Conditions Privacy Policy Credits and Legal Notice

renesim GmbH

Branch office (appointment only):
16 Hanover Square, Mayfair
W1S 1HT London, United Kingdom
T +44 20 351 466 05

Amiraplatz 1, D-80333 Munich
T +49 89 1222 893 0

Hours Mon - Fri 8 am - 6 pm


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As an online jeweller, RenéSim combines the benefits of a modern online-based business model with 180 years of family-run traditional craftsmanship in the jewellery industry. Gemstones such as diamonds are the central focus at RenéSim; we supply high-quality, thoroughly individual pieces such as engagement rings in addition to loose diamonds. We offer unique diamond post earrings, diamond rings, memory rings, engagement rings and much more. Consult the jewellery experts at RenéSim!

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