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The ornamental design for a gemstone, as shown and described.
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FIG. 1 is a front and right side view of a gemstone showing my new design.
FIG. 2 is a plan view thereof.
FIG. 3 is a bottom view thereof.
FIG. 4 is a cross-section thereof.
FIG. 5 is a top perspective thereof.
FIG. 6 is a bottom perspective thereof; and,
FIG. 7 is a side perspective thereof.
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