Gemstone treatment
Heat Treatment, Quartz
Amethyst may turn yellow, orange, brownish, or greenish depending on source and heating conditions. Smoky quartz can lighten or shift color.
01
What to look for
Amethyst may turn yellow, orange, brownish, or greenish depending on source and heating conditions. Smoky quartz can lighten or shift color.
02
What it means
Heating is common in commercial citrine and other quartz colors. It changes color centers and iron-related coloration.
03
Expert move
Much commercial citrine is heated amethyst. Look for unnatural orange zoning or color concentrated near the tips in crystal material.