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The ornamental design for ornamental gemstone, as shown and described.
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| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Sep 29 2015 | LOINGER, CHRISTIAN | Swarovski Aktiengesellschaft | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 036751 | /0185 | |
| Oct 07 2015 | Swarovski Aktiengesellschaft | (assignment on the face of the patent) | / |
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