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I claim the ornamental design for a gemstone, as shown and described.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Oct 07 2013 | SHAH, RITESH | SHAH, AMISH | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 035108 | /0352 | |
| Feb 26 2015 | Amish, Shah | (assignment on the face of the patent) | / |
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