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Rough diamonds: Diamonds in the raw

Rough Diamonds

Are you interested in rough diamonds?

Rough diamonds are unworked, uncut diamonds, and are gems of enigmatic power because the quality of a diamond cannot be determined in its uncut state. Only after cutting and polishing can the quality and clarity of a diamond be established. Even state-of-the-art technologies can only provide limited assistance in estimating the value of a diamond. The critical factor in creating a valuable diamond is the craftsmanship and expertise of the diamond polisher.

Where can rough diamonds be purchased?

It is extremely difficult for individuals to buy uncut diamonds, which are sold directly to diamond polishers from all over the world at diamond exchanges or 'bourses' to which individuals have no access. Consumers thus generally only have the chance to purchase cut and polished diamonds.

Simply contact us with your request

Diamond Ring Munich from RenéSim

If you plan to purchase diamonds or gemstones, we are confident you will find what you seek at RenéSim. We offer over 250,000 loose diamonds in a wide variety of sizes, cuts and shapes, together with information on the main factors to consider when purchasing a diamond. Benefit from our expertise! We look forward to receiving your request without obligation.

Or call us: UK  +44 20 351 466 05 International +49 89 1222 893 0

From rough diamonds to sparkling cut diamonds

Where do rough diamonds come from?

The global centre of today's diamond trade is Antwerp. Rough uncut diamonds from diamond mines all over the world (Africa, Australia, China, Canada, Russia and South America) are delivered to diamond exchanges or 'bourses' in Antwerp, where they are sold to diamond polishers. These rough diamond exchanges are closed to individuals.

The largest rough diamond bourse in the world

Diamantkring in Antwerp is the world's largest bourse for rough diamonds. Since the most rigorous criteria apply to membership, for many years this exchange has numbered only two German companies among its full members. At the bourse, rough diamonds are sold on to diamond polishers all over the world, the majority of which are located in India, Israel, China and Belgium. There, rough diamonds are cut and polished in elaborate and complex processes.

Cutting raw diamonds

Estimating the quality of a diamond before it is cut is an extremely difficult process. Diamond quality is determined by four criteria known as the Four Cs: Colour, Carat, Clarity and Cut. Diamond cutting requires an exceptional degree of craftsmanship and expertise, as the cut brings out and maximises the stone's brilliance and fire.

How do diamonds reach the consumer?

After cutting, diamonds are sold at a diamond exchange to wholesalers, who sell them to jewellers, goldsmiths and jewellery manufacturers. From this stage the cut diamonds can be purchased by individuals as an investment or in the form of beautiful jewellery.

Search our extensive online database of up to 250,000 cut diamonds. We are confident you will find a diamond that suits your wishes:
Purchasing diamonds.


You may also be interested in the following:

Engagement rings that make any heart beat faster: engagement rings in gold or platinum.

Are you interested in loose diamonds? Up to 250,000 diamonds in our database: Purchasing Diamonds.

Or are gemstones your interest? We have assembled the most important information for you: Purchasing Gemstones.

Take a look at the jewellery in our Loved & Jewelled Collection - jewellery featuring a cabochon-cut heart-shaped stone.

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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

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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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