Rose Sphere 240-120 by Bob Keller

Rose Sphere 240-120 - designed by Bob Keller ©1999
240 facets 120 index
L/W = 1.000 H/W = 1.000 Vol./W^3 = 0.494

Hemisphere A
p 90.00 003-009-015-021-027-033-039-045-051-057-
063-069-075-081-087-093-099-105-111-117
Cut to equal depth, set size
1 81.11 003-009-015-021-027-033-039-045-051-057-
063-069-075-081-087-093-099-105-111-117
Cut level girdle (equator) line
2 72.83 120-012-024-036-048-060-072-084-096-108 Meet p,1
3 71.09 120-012-024-036-048-060-072-084-096-108 Meet 1,2
4 63.29 003-009-015-021-027-033-039-045-051-057-
063-069-075-081-087-093-099-105-111-117
Meet 1,2,3
5 45.35 003-009-015-021-027-033-039-045-051-057-
063-069-075-081-087-093-099-105-111-117
Meet 3,4
6 41.51 120-012-024-036-048-060-072-084-096-108 Meet 3,4,5
7 29.60 120-012-024-036-048-060-072-084-096-108 Meet 5,6
8 25.79 006-018-030-042-054-066-078-090-102-114 Meet 5,6,7
9 9.45 006-018-030-042-054-066-078-090-102-114 Meet 7,8,apex (pole)
Hemisphere B
1 81.11 003-009-015-021-027-033-039-045-051-057-
063-069-075-081-087-093-099-105-111-117
Meet 1,2 on hemisphere A
2 72.83 120-012-024-036-048-060-072-084-096-108 Meet 1,2 on hemisphere A, 1
3 71.09 120-012-024-036-048-060-072-084-096-108 Meet 1,2
4 63.29 003-009-015-021-027-033-039-045-051-057-
063-069-075-081-087-093-099-105-111-117
Meet 1,2,3
5 45.35 003-009-015-021-027-033-039-045-051-057-
063-069-075-081-087-093-099-105-111-117
Meet 3,4
6 41.51 120-012-024-036-048-060-072-084-096-108 Meet 3,4,5
7 29.60 120-012-024-036-048-060-072-084-096-108 Meet 5,6
8 25.79 006-018-030-042-054-066-078-090-102-114 Meet 5,6,7
9 9.45 006-018-030-042-054-066-078-090-102-114 Meet 7,8,apex (pole)

Rose Sphere 240-120 Cutting Notes

This meetpoint design for a rose cut sphere yields a "true" sphere. All of the vertices are equidistant from its center. Begin by cutting a 20-sided cylindrical preform. The height of the preformed cylinder must be equal to or greater than its maximum width for you to have enough material when you get to the course 9 (pole) facets. When you cut the course 1 facets for the first hemisphere, create a level 'girdle' (equator) line at half the height of cylinder.

Transfer when you've finished the first hemisphere, and repeat the course 1-9 sequence on the second hemisphere.

If you cut a Rose Sphere 240-120 of your own, be sure and let me know what you've cut and how you made out.


Index of Gem Designs

Perfect Transfer Index

Table of Contents


© Bob's Rock Shop Bob Keller