Twister

Twister - designed by Jeff Ford December 2001 jltford@net-link.net
110 facets 80 index
L/W = 1.051 H/W = 1.134 Vol./W^3 = 0.546
Hemisphere A
g 90.00 80-08-16-24-32-40-48-56-64-72 Cut to equal depth, set size
a 74.35 02-10-18-26-34-42-50-58-66-74 Cut to middle of the girdle (g facets)
b 59.80 04-12-20-28-36-44-52-60-68-76 Meet a.g.a
c 47.15 06-14-22-30-38-46-54-62-70-78 Meet b.a.b
d 36.55 80-08-16-24-32-40-48-56-64-72 Meet c.b.c
e 28.15 02-10-18-26-34-42-50-58-66-74 Meet d.c.d, at apex
Hemisphere B
a 74.35 02-10-18-26-34-42-50-58-66-74 Cut to middle of the girdle (g facets)
b 59.80 04-12-20-28-36-44-52-60-68-76 Meet a.g.a
c 47.15 06-14-22-30-38-46-54-62-70-78 Meet b.a.b
d 36.55 80-08-16-24-32-40-48-56-64-72 Meet c.b.c
e 28.15 02-10-18-26-34-42-50-58-66-74 Meet d.c.d, at apex

Twister Cutting Notes

The Twister Design File is available for GemCad users.

Twister was inspired by a $12 piece of cut leaded glass that I found in a store, you know the bob type things that people hang from the rear view mirror. The tag on the crystal said Mozart Ball Prism, a Google search found this picture of one on the web. The original is actually a tear shape, my variation is a sphere.

Twister is for the most part is a meetpoint type cut with a two step twist from top to bottom. I recommend cutting the girdle (g) facets first, making them equal depth. The first row of "a" facets get cut to the midpoint of the girdle/stone without a meetpoint reference. The "b" facets are then cut to the meets formed by the "a" and "g" facets. The remaining facets "c-d-e" are cut to meet with preceding facets in a similar manner. Transfer the stone after completing the first hemisphere and cut the second set of "a-b-c-d-e" facets in the same manner as the first hemisphere.

If you cut a Twister of your own, be sure and let me know what you've cut and how you made out.


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