A precious stone. Precious stones were stones that were considered quite valuable; usually because they were quite shiny, due to their crystal-like structure; and they were often used for jewelry. In the 1970s, the County Museum of Art had a large exhibit of precious stones and the most valuable one in the collection was the Star of Persia. Types of precious stones Diamond Ruby Sapphire Star sapphire Zircon References ↑ As seen in the Superfriends season one episode The Planet-Splitter (1973). ↑ As seen in the Superfriends season one episode The Planet-Splitter (1973). External Link Precious stone at Wikipedia Retrieved from "https://superfriends.fandom.com/wiki/Precious_stone?oldid=82340" Categories: Minerals Community content is available under CC-BY-SA unless otherwise noted.