Buyer's guide
Opal
Opals vary widely. Like snowflakes or fingerprints, each one is different.
What to look for
Play-of-color
The most important factor. Look at background color, pattern plus the flashes.
Clarity
Ranges from transparent to opaque. Different types prize different levels.
Cut
Domed surfaces give the best play-of-color.
Carat
Common sizes run 6×4 to 8×6 mm, yet opal comes in a wide range.
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