Encyclopedia
Precious Stones
precious stones - natural diamonds, emeralds, rubies, sapphires and alexandrites, as well as natural pearls in raw (natural) and processed forms. Unique amber formations are considered equivalent to precious stones in accordance with regulations established by the Government of the Russian Federation. The present list of precious stones may be amended only by federal law;
Source: Federal Law No. 41-FZ of March 26, 1998 (as amended on July 19, 2011) "On Precious Metals and Precious Stones"