Q:

How do you determine the value of an opal?

A:

Quick Answer

There is no standardized method to determine the value an opal because each stone is so unique, but some of the factors that influence value include the type, body tone, faults, brilliance, play of color and pattern. Stone size and the quality of the cut and polish are also factors.

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Full Answer

A solid opal is more valuable than a doublet or triplet, and factors that affect the rarity of the stone, such as dark body tone and rare patterns such as the harlequin or the straw, greatly affect the value, according to Opals Down Under. The brilliance of the colors also comes into play, and what would otherwise be a valuable opal can become worthless if there are too many faults in the stone. Since there are so many contributing factors to determining an opal's value, the Gem Stone Society recommends always having an opal professionally appraised.

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