How can this phenomenon occur naturally?
Colour on the outside combined with a colourless inside, however, does not always point to human interference. Kashif Khan, owner of diamond auction Ritchies, discovered this first hand many years ago, when he got the opportunity to buy fancy coloured green diamonds. Contrary to other coloured diamonds, the green type does not receive its colour during their forming stage, but only after being exposed to radiation at the planet’s surface.
Khan quickly discovered that the radiation had not penetrated the complete diamond, resulting in a natural colour on the outside and no colour on the inside, causing their value to plummet. Fortunately, he was able to resell them with a profit to a fascinated geologist.
How can I be sure to buy genuine fancy coloured diamonds?
Along with the announcement that the odd fancy coloured diamond was synthetically enhanced, the GIA offered some tips on how to expose the misleading coloured diamonds. Firstly, the DiamondView brought to light certain fluorescent zones with sharp edges. These edges do not exist in natural diamonds, which show the phenomenon all the way through. Secondly, a close look reveals a straight boundary line between the thin layer of synthetic diamond and the natural gem.
Where can I buy fancy coloured diamonds as an investment? Contact the diamond experts at BNT Diamonds for guidance in your investment.