Gemstone treatment
Surface Coating
Iridescent or metallic color film, strongest on pavilion facets or protected areas. Scratches, chips, and facet junction wear may reveal colorless material underneath.
01
What to look for
Iridescent or metallic color film, strongest on pavilion facets or protected areas. Scratches, chips, and facet junction wear may reveal colorless material underneath.
02
What it means
Coatings create color or optical effects on the surface only. They can be damaged by wear, polishing, or chemicals.
03
Expert move
Inspect facet edges and abraded areas. If the color disappears at a scratch, suspect coating.