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It is the RADICAL SIGN , its definition is - the symbol used to indicate a nonnegitive square root.
The apostrophe looks similar to, but is not the same as, the prime symbol ( ′ ), which is used to indicate measurement in feet.
Radical Sign
Parenthesis indicate that the enclosed members are a set. The brackets indicate that what enclosed Êinside of itÊis an option.
The term .031 may indicate the carat weight of the stone. Without a context it is uncertain, however.