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What makes an aquamarine a "double blue" aquamarine?

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asked Mar 2, 2016 by wi.dragonfly (120 points)

1 Answer

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Never heard that expression used before. Can you please provide some context for its usage? I.e. where you heard it used, or if you have an associated picture of an item used with this term?
answered May 3, 2016 by hershel (51,840 points)