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Antique, Art Deco, 18ct Rose Gold, French, Natural Colour-Change Sapphire and Diamond Cluster Ring

Product SKU: ARB-221

Colour-change sapphire and diamond ring, 20th century. This unheated Sri Lankan sapphire appears a subtle cornflower blue in daylight, and a soft violet in incandescent light. The reason for this unusual phenomenon is the presence of Chromium in the stone, which gives the stone its violet hue, and interacts with different colours of light to change the shade of the stone. The presence of Chromium also means that, unusually for a blue sapphire, it also fluoresces red. Under  The design is a classic cluster with touches of Edwardian inspiration, particularly in the millegrained settings of the diamonds, making it a beautiful and timeless choice for an engagement ring.


Place Of Origin


Stone Type

Sapphire: approx. 3.4 carats
Diamonds: approx. 0.60 carats total
Accompanied by GCS report no. 79227-83, stating that the sapphire is of Sri Lankan origin, with no indications of heat treatment.

Stone Dimensions

Sapphire approximately 8.5 x 7.5 x 5.4mm
Height of setting: 7.5mm
Width of setting at front: 17.2 x 15.5mm

Metal Type

18 carat yellow gold


French import assay mark for 18 carat gold

Date Of Manufacture

20th century

Period Of Manufacture

Art Deco


Very good

Signs Of Wear

Very minor wear commensurate with age