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In gemology, rhinestones are imitations of precious stones made from special types of jewelry glass.

Ebonite, created in the middle of the 19th century by Charles Goodyear, has entered our daily life not only as an industrially valuable organic material, but also as a material for imitation of jewelry materials - horns, tortoise shell, jet,

Stone flowers are aggregates of individual crystals that form an aggregate that resembles a flower.

Among diamonds, very rarely, but also stones with a color change effect come across.

Sometimes in jewelry of the late 20th century, you can see inserts with small green crystals that have grown on a flat base,