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The International Gem Society (IGS) has a list of businesses offering gemstone appraisal services.
Since aquamarines are available in large sizes, there’s no incremental increase in price per carat for large gems. In fact, cut aquamarines over 25 carats will have a lower price per carat than smaller stones of the same quality. Setting and wearing stones of that size can be difficult, so there’s less demand for them.
For more detailed information on aquamarine quality factors, consult our aquamarine buying guide.