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Gemstone spotlight: Pearls

Moh Hardness Scale: 2.5 to 4.5 Specific Gravity: 2.6 - 2.85 Refractive Index: 1.52 - 1.69 Colour: White, pink, yellow, silver, black, blue, green   Pearls are some of the oldest of all gemstones, perhaps the oldest. Valued since ancient …