For use in jewellery, most opal is cut and polished to form a cabochon, a convex shape that maximises the viewing angles through which an opal's play of colour can be observed. Natural opal refers to … Opal is the product of seasonal rains that drenched dry ground in regions such as australia’s semi-desert “outback. ” it is known for its unique display of flashing rainbow colors.

Guidance for people who want to buy opal, see different types of opal, understand their names, learn about synthetics and imitations.

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