Bi-Colour Sapphire from Sri Lanka 6.67 Carats Unheated Octagon

Natural bi-colour sapphire of 6.67 carats from Sri Lanka, octagon cut (double brilliant crown, modified step-cut pavilion). Blue and yellow share the stone in two clearly readable zones — an entirely natural colour zoning, specific to the growth conditions of corundum, which the lapidary chose to showcase rather than conceal.

Its colour is entirely natural: the Swiss laboratory GFCO Gem Lab concludes “no heat - no treatment”, with microscopic observation of inclusions characteristic of unheated stones.

Characteristics

• Stone: Natural corundum — bi-colour sapphire
• Weight: 6.67 carats
• Colour: Blue and yellow
• Shape: Octagon, double brilliant crown / modified step-cut pavilion
• Dimensions: 10.76 × 9.03 × 7.21 mm
• Origin: Sri Lanka
• Treatment: Unheated, untreated
• Certificate: GFCO Gem Lab, Switzerland (no. AAP91161-47058-1)

The stone is delivered with its original certificate. It can be custom-mounted as a ring or pendant by our partner bench jeweller — contact us to discuss.