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Gemstone spotlight: Alexandrite

Name: Alexandrite Moh Hardness Scale: 8.5 Specific Gravity: 3.7 Refractive Index: 1.76 Colour: Blue-green in daylight; pink-red in incandescent light     Alexandrite is precious gemstone with peculiar properties and a peculiar past. This gemstone exhibits a colour change effect, appearing green to blue in bright light, while in more moderate light it shifts to […]