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The ornamental design for gemstone, as shown and described.
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FIG. 1 is a top plan view of a gemstone showing our new design;
FIG. 2 is a bottom plan view thereof;
FIG. 3 is a perspective view thereof;
FIG. 4 is a side elevational view thereof; and,
FIG. 5 is a further side elevational view thereof as viewed from a corner of the gemstone.
Shimansky, Yair, Siman-Tov, Siman
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