Opal in large sizes are rare and costly, especially black opal. Opals are sually cut as cabochons and beads. Occasionally they are found as fossilized (opalized) clamshells, snail shells, or wood. Transparent opals, such as Mexican red or orange fire opal, are often faceted. Values are normally determined by the presence and nature of color flashes. In the Middle Ages, opal was believed to provide great luck because it possessed all the virtues of each gemstone whose color was represented. The opal is the official gemstone for Australia and Nevada.
Gold Price
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