Modified Asterism

It is possible to imitate asterism in gemstones by engraving several sets of parallel lines or grooves in flat or curved surfaces of the stones or cutting six-rayed star on the surface of a suitable cabochon, with tools such as rotating or vibrating iron rod. The technique is widely used in producing man-made asterism in rubies, sapphires and other colored stones including glass. A modified technique may be used to produce fake asterism in mainstream colored stones. The fake star stones are sold worldwide, but may be seen more frequently in Thailand, Sri Lanka, India, Burma, East Africa, Europe and United States, the colored stone centers of the world. An interesting fact is asterism in natural stones is due to the presence of needle-like inclusions, but they are not seen in these fake cabochons. In addition, the so-called called stars are not properly oriented and overall the stones look asymmetrical and lack the natural appearance.

Well informed buyers will always look carefully for the right star pattern, color, and finally, the top and base. In most cases the producers of fakes are not properly identifying the minerals before engraving, because highly radioactive crystals or crystal fragments have been used and sold with an incorrect but common mineral name. If in doubt always consult a reputed gem testing laboratory.