Which term means using heat to stabilize irradiated color in gemstones?

Which term means using heat to stabilize irradiated color in gemstones?

• A. Abrasion
• B. Bast
• C. Annealing
• D. Adamantine luster

Answer: (C)

Using heat to stabilize irradiated color in gemstones is annealing. Irradiation creates color centers in a gem’s crystal lattice, producing vivid hues that can be unstable. By heating to a controlled temperature and then cooling slowly, the lattice rearranges enough to lock the color in, making it more stable and less prone to fading with further heat or light exposure. This approach is common for stabilizing colors in irradiated stones. Abrasion refers to surface wear, bast is unrelated to gem treatments, and adamantine luster describes a brilliant appearance, not a treatment process.

Using heat to stabilize irradiated color in gemstones is annealing. Irradiation creates color centers in a gem’s crystal lattice, producing vivid hues that can be unstable. By heating to a controlled temperature and then cooling slowly, the lattice rearranges enough to lock the color in, making it more stable and less prone to fading with further heat or light exposure. This approach is common for stabilizing colors in irradiated stones. Abrasion refers to surface wear, bast is unrelated to gem treatments, and adamantine luster describes a brilliant appearance, not a treatment process.