The blue diamond adopts its luxurious colour at an early stage, when boron first appears. The more boron, the more intense the colour. Very occasionally, due to the additional presence of hydrogen a greyish blue appears.

Blue diamonds generally come from South Africa, while a small number of deep blue diamonds are found in Central Africa, Brazil & Borneo. Historically, blue diamonds have been found in India and metallic blue diamonds have been found in the Argyle mines in Australia. In November 2014, a 9.75 carat blue diamond, the Mellon Blue, sold for a staggering $32.6 million at Sotheby’s in New York, before being renamed the Zoe Diamond.

A pink diamond is formed under astounding pressure under the earth’s surface when its crystal lattice deforms.

Fancy coloured diamonds, including pinks, generate even higher returns than colourless diamonds. Rare pink diamond prices have increased by 443 percent in the last 10 years and in some cases can reach 50 times the price of a colourless diamond equivalent. The largest mine for pink diamonds is the Australian Argyle mine, although smaller quantities are also mined in Borneo, Guinea, Brazil, Angola and South Africa.

Fiery yellow coloured diamonds are created thanks to the presence of nitrogen.

Star Diamond prides itself on assembling some of the world’s most unconventional and unique diamonds, such as an exceptionally rare lime diamond. 

Yellow diamonds are mostly mined from Brazil, Russia, Australia and Africa. The more intense colours are typically found in South Africa.

Orange and brown diamonds, often called cognac, champagne and even cinnamon diamonds, are formed by the presence of nitrogen.

A pure orange colour is the rarest colour of this category and is caused by a combination of nitrogen atoms and structural deformities. 

Brown tone diamonds are mined in Australia, Borneo, Brazil, the African continent and Russia. Orange diamonds are found in South Africa, the Democratic Republic of Congo and Russia.

Green diamonds colour is derived from exposure to gamma rays way below the earth’s surface over an extensive period of time, perhaps millions of years. 

They are among the rarest diamonds in the world.

Most green diamonds are sourced from British Guyana, Borneo, Brazil and Central Africa.