A fixture for clamping gem

The utility model relates to a fixture for clamping a gem. The fixture for clamping the gem comprises a fixing device, wherein the fixing device is arranged on a workbench of a machine tool, a tool is arranged on the machine tool, and the tool is positioned above the fixing device. The fixing device comprises a base, a clamping seat and locking bolts, wherein the clamping seat is positioned above the base and is connected with a base through the locking bolts. The fixture for clamping the gem is provided with a first arc-shaped surface and a second arc-shaped surface and a through hole is formed in the clearance between the first arc-shaped surface and the second arc-shaped surface, and the gem is placed in the through hole, the clamping seat is pressed to the direction of the base through clamping screws, and the gem is fixed. In long-term use of the fixture for clamping the gem, the phenomenon of loose does no occur, and mounting and dismounting of the gem is convenient and fast. The fixture for clamping th