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

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

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

Answer: (A)

Stabilizing color produced by irradiation is accomplished through a heat treatment called annealing. Irradiation creates color centers in the gemstone’s crystal lattice, but these centers can be unstable and may fade or change with time. By applying controlled heat, the lattice allows defects to migrate and settle into more stable configurations, locking in the color so it remains more permanent. This is a common practice to make irradiation-induced colors reliable and long-lasting. The other terms don’t describe this process: adamantine luster refers to a diamond-like shine, not a treatment; abrasion is wear from friction; bast is a plant fiber.

Stabilizing color produced by irradiation is accomplished through a heat treatment called annealing. Irradiation creates color centers in the gemstone’s crystal lattice, but these centers can be unstable and may fade or change with time. By applying controlled heat, the lattice allows defects to migrate and settle into more stable configurations, locking in the color so it remains more permanent. This is a common practice to make irradiation-induced colors reliable and long-lasting. The other terms don’t describe this process: adamantine luster refers to a diamond-like shine, not a treatment; abrasion is wear from friction; bast is a plant fiber.