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Need Help Identifying

I’m trying to appraise this stone, but I can’t tell if it is a synthetic, sky blue topaz, or an aquamarine/beryl. If anyone can tell from the photos, I’d greatly appreciate it!

If the setting is fairly old, I think your chances are good that it’s a light colored aqua, but the only way to be sure is to have the stone tested.

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The ring still has the Stuller style number and mm size stamped in raised letters inside the shank, so I doubt the ring is older, but cannot verify the age of the stone. A local gem identifier has passed away since the last time I contacted him. Assuming GIA would be the next best option, but if anyone knows of anyone who could identify stones in the MidWest, appreciate any info. Thanks