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How to Tell the Difference Between Gemstones and Glass

Sphene has an unusually high refractive index (1.843-2.110), higher than zircon, ruby and sapphire.

Sphene has an unusually high refractive index (1.843-2.110), higher than zircon, ruby and sapphire.

Leibish & Co. will present this 3.37-carat fancy intense pinkish-purple diamond, valued at $4 million, at the upcoming September Hong Kong Jewellery and Gem Fair, scheduled for Sept. 15 to 19.

Genuine Purple Sapphire Loose Gemstone, Purple Violet Color, Emerald Cut, 7.1 x 5.6 mm, 1.98 Carats at BitCoin Gems

Genuine Purple Sapphire Loose Gemstone, Purple Violet Color, Oval Cut, 9.6 x 7.3 mm, 2.76 Carats at BitCoin Gems

After 75 hours at the grinding wheel, master diamond cutter Mike Botha finally put the finishing touches on the "Esperanza" diamond — a gemstone that was plucked from the soil by Bobbie Oskarson at Arkansas' Crater of Diamonds State Park on June 24. Originally 8.52 carats in weight and the shape of an icicle, "Esperanza" has been transformed into a sleek and unique 4.65-carat "triolette."