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This item does not come with the Gemstone, only the Pendent itself. It's designed for a round Gemstone, around 5.31mm in size. It may or not not properly fit larger or smaller stones. As of such, if you have an interest in this Pendant, you should get an extremely accurate measure (within 1/100th of a Millimeter) and contact me with the size you need. Then I can scale up a version of the Pendant to match your needs.
The Embossing on the backside reads "Open Minds Opens Eyes"