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Calibrated Opals

Calibrated opal is the term for opal that has been cut and polished in oval sizes that are on a calibrated scale. For example, A 6 x 9 millimetre calibrated opal is a standard size opal and would go in well in a set of earrings or a ring but if you wanted a pendant you would want a bigger calibrated stone like a 14 x 10 millimetre. Most calibrated opals have been cut and polished in China where labor is cheap and fast. White opal is the most calibrated type of opal used because of its quantity available and its lower quality. Calibrating machines have been made to automatically…

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