The powerful colours of the sea and the sky meet in the exceptional Argyle Certified blues.

Blue diamonds are considered extremely rare and mysterious. They range from the light blue sky of a winter’s day to the deep blue of the ocean.


The Cullinan mine in South Africa and the Golconda region in Southern India are the most notable areas for blue diamond mining.

The most famous blue diamonds in history are the 45 carat, deep-blue Hope Diamond, rumoured to have originated from India and the 31 carat deep-blue Wittelsbach Diamond with internally flawless clarity.

Blue Diamonds by Stelios Jewellers in Perth
Blue Diamond Ring by Stelios Jewellers in Perth


The vast majority of blue diamonds owe their colour to the presence of boron.

The bonding of boron to carbon causes absorption in the red, yellow and green parts of the spectrum producing a blue colour. Blue Diamonds may contain a grey, violet or greenish modifying colour.


The strength of colour is one of the most important factors in determining the value of a natural colour diamond, which increases with the intensity of the most prominent colour within it.

Blue Diamonds Rarity and Value Chart