Not all yellow diamonds are created equal. The Ellendale field produces the worlds most exquisite Fancy yellow diamonds
Ellendale Fancy Yellow diamonds are extremely rare. Less than 1 in 100,000 carats is true Ellendale Fancy Yellow Diamond. Ellendale Fancy Yellows are sought after by leading luxury buyers such as Tiffany, Graff, Bvlgari and Harry Winston.
Until the closure of the hard rock mines at Ellendale in 2015, Tiffany & Co held exclusive rights to buy 100% of the Ellendale Fancy Yellow diamond production. At one time Ellendale produced around 50 per cent of the world’s entire supply of Fancy Yellow diamonds.
In addition to producing the worlds most exquisite yellow diamonds, it was at Ellendale that scientists first confirmed that a special type of volcano known as Lamproite could also produce diamonds. For almost 40 years, Australian geology professor Rex Prider postulated that lamproites might theoretically host diamonds but until the discovery of diamonds at Ellendale in the 1980's, kimberlite structures (another type of volcanic structure) were the only known source of diamonds in the world.
Natural coloured diamonds are extremely rare. Among the rainbow of colours the shiny and brilliant yellows are the most popular but this does not mean they are common. Approximately 1 out of every 100,000 carats mined is an Ellendale Fancy Yellow diamond .
Yellow diamonds are extremely rare with less than 1 in 10,000 carats being coloured and less still being yellow. Only 1 in 100,000 carats is an "Ellendale". Until 2015 the Ellendale field was the largest single producer of gem quality yellow diamonds in the world. The dazzling hue of yellow and orange diamonds is attributed to the presence of nitrogen within the chemical composition of the diamond crystal. Nitrogen atoms arrange in such a way that blue light is absorbed, thus producing a yellow colour. A specific grouping of nitrogen atoms is also responsible for the shading of orange diamonds.
The Ellendale field has also produced green diamonds. These amazing and exceedingly rare diamonds have been exposed to naturally occurring radiation during their journey to the earths surface which causes them to reflect a green hue by absorbing red and yellow light.
Brown, Red and Pink Diamonds
These diamonds owe their colour to a combination of intense pressure and heat during formation causing distortions in the crystal lattice that causes them to absorb green light, thus reflecting a pink hue.
Grey and Blue Diamonds
Blue diamonds get their colour from the presence of boron. Boron bonds to carbon in the crystal structure, absorbing red, yellow and green light within the colour spectrum.
Violet and Purple Diamonds
The cause of colour for purple and violet diamonds is not well understood and maybe due to crystalline distortion or the presence of hydrogen or both.