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GlossaryAmmonia - a white crystalline double sulfate of aluminum: the ammonium double sulfate of aluminum Amethyst - a transparent purple variety of quartz; being used as a gemstone CGI - Caribbean Gemological Institute Lapis Lazuli - an azure blue semiprecious stone Renaissance - the period of European history at the close of the Middle Ages and the rise of the modern world; a cultural rebirth from the 14th through the middle of the 17th centuries. Tourmaline - a mineral that is a complex borosilicate and hydroxide of aluminum containing iron and magnesium and calcium and lithium and sodium; it is usually black but occurs in transparent colored forms that are used as gemstones. |
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