Crystal falls in 3 main categories: 1. Fine Crystal or Crystalline - A glass mixture containing 5% - 10% Pb Oxide. 2. Leaded Crystal - A glass mixture that contains 10% - 24% lead oxide. 3. Full-Leaded Crystal - A glass mixture that contains 24% lead oxide or more. · Austrian crystal is the 2nd best crystal. It contains 30% lead oxide. · Although it is from Austria, Swarovski crystal IS the world’s finest crystal available. Their full-leaded crystal “recipe”, which is patented, is 32% lead oxide. (In case you were wondering, anything more than 32% would cause the crystal to lose its luster, increase the fragility of the piece, and lose its refractive properties.) · Crystal by European standards recognizes 24% lead content as crystal.· In contrast, American standards recognize any glass that is perfectly clear as crystal regardless of the lead content.
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