Amethyst Tumbled Gemstones from Brazil - 20-40 mm - 1 LB. LOT Menu Flames where trace amounts of chromium

where trace amounts of chromium replace aluminum ions in kyanite crystals

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Sometimes fire opals that do not display "color play" are referred to as jelly opals

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providing a visual representation of the geological processes that contribute to its unique appearance during mineral transformation

Amethyst Tumbled Gemstones from Brazil - 20-40 mm - 1 LB. LOT Menu Flames where trace amounts of chromiumQuantity: 1 pound Pieces measure approximately 20 40 millimeters. Amethyst is a violet gemstone that occurs when quartz containing significant iron impurities and other trace elements undergoes natural geological irradiation over long periods of time, altering the color. Variations in color occur based on the amount of iron and the specific trace elements present in the original quartz.