| 摘要 |
<p>A gem holder for fixedly holding a plurality of gemstones 2 during notching by means of a laser comprises a plurality of relatively flat strips 14, each having a plurality of datum notches 18 cut across at least one of its longitudinal edges, and a base plate 10, at least the upper surface of which is provided with at least one set of substantially parallel slots in which the strips are insertable to be securely held therein. With the strips inserted into the slots of the base plate, the datum notches of the strips define a plurality of substantially parallel columns 20. The gem holder is used with notching apparatus comprising a laser device adapted to produce a focussed beam, and means for producing a controlled relative movement between the gem holder and the laser beam along at least two different axes. <IMAGE></p> |
