Tagged “jade”
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Type A, B and C jadeite
The letters are a treatment classification, not a quality grade. What each one means, what it applies to, and why a listing's Grade A is neither.
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Hardness, toughness, and why tools break
Hardness resists scratching. Toughness resists fracturing. They're different properties, and the harder stone is often the one that snaps.
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Nephrite, jadeite, and what jade means
Jade is two unrelated minerals with different compositions and hardnesses — plus a long list of trade names for things that are neither.