Diamond
Rough diamonds require the strictest paperwork in the trade. We only offer parcels that carry valid Kimberley Process certification.
In short
Every rough diamond we handle travels with a Kimberley Process certificate and an independent valuation.
- Formula
- C
- Density
- 3.52 g/cm³
- Hardness
- 10 Mohs
- Priced in
- USD per carat, by quality
What it is
Diamond is pure carbon crystallised under extreme heat and pressure deep in the Earth. It is the hardest natural material. Gem-quality rough is cut and polished for jewellery; lower grades are used as industrial abrasives.
Supplied as
- Rough parcels
- Sorted and graded lots
Who buys it
- Cutting and polishing for jewellery
- Industrial abrasives and tooling
What we check before we sell
- 01Kimberley Process certificate
- 02Independent valuation
- 03Weight and parcel description
From raw to refined
How diamond becomesa polished diamond.
Follow diamond through 8 stages, from the moment it leaves the ground to the finished piece. Keep scrolling: each step has its own photograph or film.
Mine · Open-pit diamond mine
Pipes of volcanic rock
Diamonds formed deep in the Earth and were carried up in volcanic pipes of kimberlite. Mines dig these pipes as vast open pits, then follow them underground.
Next commodity
Ruby