One of or class projects last term was to make a boat shaped mount for a marquise stone, from a dome cut in half, the edges rubbed smooth and then re-assembled.
It is also possible to remove a wedge shaped piece for a shallower boat.
The starting diameter of the metal disk used needs to be about 25% greater than the stone is long. The chosen hollow of the doming cube should have a similar curvature to the girdle of the stone.
Once made it is still possible to tweak the overall shape with parallel pliers, or a safe vice for a better match. The height of the sides is then filed to be only just above the girdle of the stone.
My first picture shows a large display piece for our classroom cupboard.
Picture 2 shows the mount on a ring. The bearer has been cut with burrs, so is a little ragged.
Picture 3 shows the finished ring using a 12x6mm CZ, which we were given. Dennis.
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