Honey yellow. Fiery orange. Cyclamen pink. Icy blue. In warm or cool tones, topaz is a lustrous and brilliant gem.
Colorless topaz treated to blue is a mass-market gem. Fine pink-to-red, purple, or orange gems are one-of-a-kind pieces. Top sources include Ouro Prêto, Brazil, and Russia's Ural Mountains.
Irradiating colorless topaz with electrons at energy of 10 million electron volts creates a sky blue color.
The royal court in Portugal celebrates the discovery of Imperial topaz in 1768.
Opal contains up to 20% water trapped in its silica structure.
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