by Tom Herbst
This is a simple, stretched triangle cushion that performs very well.
This design was originally intended for a piece of blue Aussie sapphire
and given the inspired name "BS" (Blue Sapphire). The sapphire
turned out well, albeit a little saturated. I recognized that the design
was sound, and adjusted the angles for beryl, leading to the equally inspired
name "BBS" (Beryllized Blue Sapphire). Atta boy, Shakespeare.
BBS is a straightforward design, and is appropriate to all skill levels.The
design fits readily into commercial Tripps-type mountings. BOG-optimized
for ISO and tilt.
At right is a 6x8 mm 0.74 carat BBS cut in Aquamarine. This material
had a very crumbly zone, leading to the major flow in the lower left corner.
GemCAD and GemRay output for Figaro appear below. The GemCAD file is available