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Treatment Definitions

 

Bleaching

Bleaching is a treatment used to lighten or remove color of a porous gem, it could include heat, light or chemicals.

Coated

Coating is a method of enhancement that can vary widely. A gemstone may be coated to protect dye treatments; to improve appearance; provide color or add other special effects.

Diffusion

Treatment This is a gemstone treatment that alters the color of stones through a combination of chemical exposure and heat treatment. FTC requires that diffusion be disclosed on gemstones in advertising.

Dyeing

The introduction of coloring matter into gemstones to give them new color, intensify color and/or improve color uniformity.

Filling

Filling surface-breaking fractures or cavities with a glass, plastic, solidified borax or other substances to improve clarity, appearance, stability, or add weight to a gem.

Heating

Heating is an enhancement treatment used for centuries to change the color of various materials. The use of heat can effect color, clarity or phenomena.

High Temperature, High Pressure (HTHP)

Application of heat and pressure combined to effect alteration of color, clarity and or phenomena.

Impregnation

When a porous gemstone is permeated with a polymer, wax or plastic to give it greater durability, and improve its appearance.

Irradiating

The use of neutrons, gamma rays or beta particles to alter a gemstones color. May be followed by a heat process.

Waxing/Oiling

The surface of a porous opaque or translucent gemstone is impregnated with a colorless wax, paraffin or oil to improve its appearance.

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