This Precious Gemstone Has Been Mounted in a Stunning 18 Karat Gold Ring In ancient times, opals were included among the noble gems and ranked second only to emerald by the Romans. In the Middle Ages, they were believed to be a good luck charm. Today, they are highly treasured for their luminous panoply of colors. Precious opals are translucent to transparent and are distinguished by a combination of milky to pearly opalescence and an attractive play of many colors. These colors flash and change as a stone is viewed from different directions and are caused by interference of light along minute cracks and other internal inhomogeneities. Black opal, with a very dark gray or blue to black body color, is particularly rare and highly prized. Origin: Australia Medium: Opal-Gold

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