An important green diamond ring set with a cushion-cut natural fancy light grayish green diamond weiging app. 3.53 ct. encircled by numerous fancy green brilliant-cut diamonds weighing a total of app. 0.23 ct. and brilliant-cut white diamonds weighing a total of app. 3.61 ct., totalling app. 7.37 ct., mounted in 18k pink and white gold. Colour: River (D-E). Clarity: IF-VVS. Size 53.5.
Accompanied by GIA report no. 5212067596 indicating, “Natural Fancy Light Grayish Green”. 2020.
Colour grade: Fancy Light Grayish Green.
Colour origin: Natural.
Colour distribution: Even.
Cut quality of white diamonds: Triple excellent-cut. Hearts and arrows.
The green diamond was found in the Mazaruni River, Guyana, South America under the Guyanese Kimberly mining license, which supports the local miners, in 2018.
This particular green diamond is a sublime example of sustainability in the diamond industy, as it was found in the river.
Diamonds are mined in both primary and secondary deposits. In primary deposits mining are done in the diamond ores. At secondary deposits diamonds are found away from the ores, in river beds, on beaches, and in the sea. This so called alluvial mining is known as artisanal or smaller scale diamond digging.
Smaller scale miners sift through the sediment deposits to find the stones using shovels, bare hands or sieves. There are no open mining operations, and mass production is not possible in the Mazaruni River. The process is therefore not harmful to the nature. In case there is any damage, the miners are obligated to restore the area to the original state.
Furthermore the diamond is a Fair Trade diamond. The local Amerindians, who live off the rivers are partners in the production. The mining license is renewed and payed in advance quarterly by the miners to the locals, and they are also paid a share of the profit.
Natural green diamonds over 2.00 ct. are very rare and green diamonds over 3.00 ct. as this one, are indeed extremely rare.
Among fancy-colour diamonds, natural coloured green stones with saturated hues are some of the rarest and most sought after of all natural coloured diamonds. Only a handful of natural green diamonds are introduced into the market each year.
Most of the world's current production of fine natural green diamonds comes from British Guyana.
These diamonds are coloured either by simple structural defects produced by radiation exposure or by more complex defects involving nitrogen, hydrogen, or nickel impurities.
Laboratory irradiation treatments have been used commercially since the late 1940s to create green colour in diamonds and closely mimic the effects of natural radiation exposure, causing tremendous difficulty in gemological identification. Compounding that problem is a distinct paucity of published information on these diamonds due to their rarity. Four different coloring mechanisms - absorption by GR1 defects due to radiation damage, green luminescence from H3 defects, and absorptions caused by hydrogen- and nickel-related defects - can be identified in green diamonds.
Careful microscopic observation, gemological testing, and spectroscopy performed at GIA over the last decade allows an unprecedented characterization of these beautiful natural stones. By leveraging GIA's vast database of diamond information, they have compiled data representative of tens of thousands of samples to offer a look at natural green diamonds that has never before been possible.
It took GIA New York six months to test the diamond and write the natural coloured diamond report. Because the diamond's colour has been obtained from natural radiation, the stone had to be tested by GIA in the rough state, after shaping and again after polishing. Three times in all, to ensure the colour is stable. GIA New York is the only laboratory in the world that is able to test natural green diamonds.