Stunning Natural (unheated) Ceylon Colour Change Sapphire (3.50ct approx) and Diamond Cluster Ring

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Colour-change sapphire and diamond ring, 20th century. This unheated Sri Lankan sapphire appears a striking blue in daylight, and a vivid 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 UV light. The design is a classic cluster with touches of Edwardian inspiration, making it a beautiful and timeless choice for an engagement ring. Sapphire certificate from GCS Bond Street London - stating the sapphire is unheated (natural) 3.50ct