Sumitomo Electric Industries is producing gem-quality synthetic yellow diamonds in deep yellow single crystals in sizes up to 2 ct.
Read MoreTwo new categories of grey-to-blue diamonds are described.
Read MoreThe description and properties of three fancy-colour diamonds auctioned at Christie's.
Read More
The New York lab encountered another large HPHT-treated diamond that showed stronger pink colouration.
Read MoreKnown for their great beauty and rarity, pink diamonds have long been sought after by jewellers, collectors and consumers.
Read MoreOne of the most popular exhibits at the Smithsonian Institution, the stunning Fancy Dark greyish blue Hope diamond was formally graded by GIA’s gem laboratory.
Read MoreSome treated yellow and blue-to-green diamonds show a peculiar colour zoning when viewed through the pavilion.
Read MoreThe source of colour in some diamonds, particularly fluorescent green and some yellow stones, can be very difficult to identify despite increasing knowledge about the radiation-related bands seen in the visible spectra of diamonds.
Read MoreGreenish yellow to yellowish green HPHT-treated diamonds exhibited highly saturated body colour, well-defined brown to yellow octahedral graining and visual evidence of heating, among other characteristics.
Read MoreThis article compares some of Chatham Created Gems’ synthetic coloured diamonds to natural diamonds and explains the results.
Read More
