Most coral gemstones available today are varieties of corallium rubrum, a very specific pink to red colored species of the coral genus. Coral can take millions of years to form as the process is very slow. Fossil coral is a gemstone variety of coral that has been agatized. In the trade, Corallium rubrum is sometimes referred to as 'noble coral' and is considered to be the most desirable type of coral for jewelry. Noble coral also includes the popular 'angel skin coral', a pink to salmon colored coral. All coral as gemstones are rare and valuable.
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