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A COLOUR-CHANGE PURPLE AND PINK SAPPHIRE, SAPPHIRE AND DIAMOND CLUSTER RING

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A COLOUR-CHANGE PURPLE AND PINK SAPPHIRE, SAPPHIRE AND DIAMOND CLUSTER RING

Set with an oval-cut colour-change sapphire in a circular-cut sapphire and diamond cluster surround to the 18K gold hoop

With jeweller's mark for René Boivin

Mention of the colour-change phenomenon in gemstones usually brings alexandrite to mind. Sapphires exhibiting colour-change are rare. There are two types: those that display a violet or purple hue in incandescent light which changes to blue in daylight, and very rarely those that are reddish brown in incandescent light changing to green in daylight.

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