| 摘要 |
The device of the invention serving for cutting and grinding gemstones comprises a quadrant 16 having a curved face 17 in which a vertical row of small recesses 20 is provided, the quadrant being movable vertically on a column 1 which is in turn fastened to a table T in the vicinity of the polishing or grinding wheel, an arm 18, which extends forward, being provided to serve as lateral support limiting its displacement to a floating support 21 comprising a collar 23 of polygonal shape, to which support the gemstone S is fastened, and is characterised in that the concave face of the quadrant is turned towards the side of the device. <IMAGE>
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