The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
|Is a Variety of||Garnet|
In Greek mythology, Proteus was a sea god, capable of changing his shape. It has become a noun for one who easily changes their appearance or principles.
Proteus are the only treated garnets. All the others resist change, but a few almandine/pyropes from the US will change into Proteus. The treatment brings a thin layer of metals to the surface.