The most common onyx type has two basic layers a black base and a white upper layer. Gemselect s list of precious semi precious gemstones. Also known as the queen of gems opal is the most beautiful gem among the different types of gemstones.
The most common onyx type has two basic layers a black base and a white upper layer. Gemselect s list of precious semi precious gemstones. Also known as the queen of gems opal is the most beautiful gem among the different types of gemstones.