Safeguarding against Lab Grown Diamonds

Our Guarantee

Clark Diamonds takes our responsibility to supply guaranteed natural origin diamonds very seriously.

For many years we have been receiving written guarantees from our suppliers confirming the natural origin of our diamonds – we decided that this wasn’t enough, and we need to do more.

We have now completed a major programme of investment in our ability to detect lab grown diamonds (LGD’s) in our own offices. 

DRC Technology D-Secure Plus

This machine will positively identify LGD’s with a low referral rate and can scan batches of stones, in any shape or size, in around one minute.

It came unanimously recommended by our partners in Mumbai, and we use it to screen every stone larger than 3.8mm and to double check referrals from our other kit.

Screening stones smaller than 3.8mm is possible on the D-Secure, but in the quantities we keep it can get laborious and time consuming.  For those stones we need…


De Beers Automated Melee Sorter 2

This impressive piece of kit will screen all shapes and sizes from 0.9mm to 3.8mm, conclusively identifying LGD’s with an average referral rate of 0.02% at a rate of 3000 stones per hour. 

There isn’t anything comparable on the market. It is industry leading technology made by the pre-eminent name in the diamond trade. This ensures that even the tiniest stone in our stock is confirmed to be of natural origin. 

De Beers DiamondView

This machine uses SWUV light and filters to activate any fluorescence and phosphorescence in a stone, allowing us to analyse the growth patterns in a stone to confirm its origin. We use it for stones referred by the other two machines, and sometimes just because it’s fun.


De Beers SynthDetect

This is the latest addition to our safeguarding arsenal to allow us to increase our testing capacity and efficiency.  Using the principle of time-resolved photoluminescence, an image is viewed on a high-resolution touch screen and a decision can be made whether the stone is natural or synthetic. It is suitable for testing colourless to near-colourless stones in any shape with no lower size limit, as well as any item of jewellery for when the need arises.  We use it in the same way as the D-Secure; to test larger stones and referrals from the AMS2.

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