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The ornamental design for a gemstone, as shown and described.
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FIG. 1 is a side view of a gemstone showing our new design.
FIG. 2 is a perspective view thereof;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a top plan view thereof.
Siman-Tov, Jacob, Siman-Tov, Avraham, Siman-Tov, Itzak, Siman-Tov, Shai
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