What is a dopstick used for in gemstone faceting?

A dopstick is a crucial tool used in the faceting of gemstones. It serves the primary purpose of holding the gemstone preform securely in place during the faceting process. This stability is essential, as it allows the gem cutter to work with precision and control while shaping the stone into the desired facets. The ability to securely grip the stone is vital, as any slipping or movement could lead to uneven facets or damage to the gemstone.

The other options describe tasks that, while related to the overall gemstone cutting process, do not utilize a dopstick for execution. Creating a specific cut, polishing the gemstone, and measuring gemstone size involve different tools and techniques that are not reliant on the use of a dopstick. By holding the preform securely, the dopstick enables the faceter to concentrate on achieving the best possible cut and polish for the finished gemstone.