ScatteringDiffusion or redirection of light encountering particles of different refractive index. Scattering occurs at any such interface - at the surface, or inside a medium containing particles.
Simulant / Simulated GemstonesSimulated stones can be anything that resembles a natural gemstone but does not have the same physical characteristics or chemical composition. Often made of glass or plastic, these imitation stones are much less expensive than the natural forms.
Synthetic GemstoneA synthetic gemstone shares a natural stone's physical, chemical and optical qualities, but it is created in a laboratory.