Rose Egg 168a-96 by Bob Keller

Rose Egg 168a-96 - designed by Bob Keller ©2014
168 facets 96 index
L/W = 1.000 H/W = 1.380 Vol./W^3 = 0.709
12-fold, mirror-image symmetry

Hemisphere A
p 90.00° 96-08-16-24-32-40-48-56-64-72-80-88 Cut to equal depth, set size
1 75.49° 96-08-16-24-32-40-48-56-64-72-80-88 Match preform, make level equator
2 68.99° 04-12-20-28-36-44-52-60-68-76-84-92 Meet preform.1
3 49.92° 04-12-20-28-36-44-52-60-68-76-84-92 Meet 1.2
4 45.99° 96-08-16-24-32-40-48-56-64-72-80-88 Meet 1.2.3
5 15.50° 96-08-16-24-32-40-48-56-64-72-80-88 Meet 3.4, pole
Hemisphere B
a 88.35° 96-08-16-24-32-40-48-56-64-72-80-88 Meet 1.2
b 81.02° 04-12-20-28-36-44-52-60-68-76-84-92 Meet 1.2.a
c 76.72° 04-12-20-28-36-44-52-60-68-76-84-92 Meet a.b
d 69.94° 96-08-16-24-32-40-48-56-64-72-80-88 Meet a.b.c
e 62.29° 96-08-16-24-32-40-48-56-64-72-80-88 Meet c.d
f 56.81° 04-12-20-28-36-44-52-60-68-76-84-92 Meet c.d.e
g 42.45° 04-12-20-28-36-44-52-60-68-76-84-92 Meet e.f
h 39.29° 96-08-16-24-32-40-48-56-64-72-80-88 Meet e.f.g
i 15.28° 96-08-16-24-32-40-48-56-64-72-80-88 Meet g.h, pole

Download PDF format printer friendly cutting instructions: [ Download Icon Rose Egg 168a-96 Printer Icon ]

Download the GemCad format design file: [ Download Icon rose_egg168a-96.gem ]

Rose Egg 168a-96 Cutting Notes

Begin by cutting a 12-sided cylindrical preform. The height of the preformed cylinder must be equal to or greater than 1.38 times its width for you to have enough material when you get to the course 5 and i (pole) facets. When you cut the course 1 facets for the A hemisphere, create a level 'girdle' (equator) line dividing the height of cylinder proportionately, allowing 1.67 times more for the z dimension of the B hemisphere as the A hemisphere.

Transfer when you've finished the A hemisphere, and cut the course a-i sequence on the B hemisphere.

If you cut a Rose Egg 168a-96 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 Keller