Tag Archives: gem grade

December’s Latest Birthstone – Tanzanite

Ever seen a clear night sky away from the city lights? The deep swathes of velvety blue and flowing violet swirl together into a richness artists have tried to capture for centuries. Stars are flung across the heavens: points of light glimmering in white and yellow and red. I could get lost gazing up into…

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Marc Aronstam on: gemstone hardness versus toughness

The more you know about gemstones, the better you understand and appreciate the gem stones in your personal jewelry collection. That’s why I’d like to blog about two properties of gem stones you often hear about: hardness and toughness. Although they sound similar, hardness and toughness of a gem are two separate, unrelated physical characteristics…

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