Description
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
France
Accompanied by GCS report no. 79227-83, stating that the sapphire is of Sri Lankan origin, with no indications of heat treatment.
Sapphire approximately 8.5 x 7.5 x 5.4mm
7.5mm
Width of setting at front:
17.2 x 15.5mm
18 carat yellow gold
French import assay mark for 18 carat gold
20th century
Very good
Very minor wear commensurate with age
