Treatment
Clarity enhancement with oil or resin
A treatment in which a substance enters surface-reaching fractures to reduce their visual prominence.
Disclosure & care
Gemstone treatments
How treatments work, why they are used, and what they can mean for care, identification, disclosure, and value.
Treatment
Diffusion treatment
A high-temperature process that introduces coloring elements at or below a gemstone’s surface.
Treatment
Heat treatment
Controlled heating used to alter or improve certain gem properties; effects and disclosure requirements depend on the material and process.
Treatment
Irradiation
Exposure to radiation to create or alter color, sometimes followed by heating.