Open28.212 Retroreflector Corner Cube Prism
Anon (Strickland, Robert W); TFG Newsletter, Jan-Apr 1996 p29; L/W=1.155 H/W=0.769 Vol/W³=0.309 96 index 4+6 facets Reflects rays back to their source, even when tilted

Open28.213 RBC-167
Conley, Richard B; Facets, Aug 2014 p10; L/W=1.099 H/W=0.686 Vol/W³=0.256 72 index 61+12 facets

Open28.214 Shield Strobe
Arajs, Roland; Unpublished; L/W=1.155 H/W=0.798 Vol/W³=0.321 96 index 61+6 facets Angles good for low RI materials

28.215 Blue Hour
Klaja, Willie; Facets Aug 2015 p15; L/W=1.155 H/W=0.679 Vol/W³=0.265 96 index 73+6 facets

Open28.216 RBC-156
Conley, Richard B; Unpublished; L/W=1.113 H/W=0.771 Vol/W³=0.306 96 index 55+12 facets

Open28.217 RBC-158
Conley, Richard B; Unpublished; L/W=1.155 H/W=0.755 Vol/W³=0.311 72 index 67+6 facets

Open28.218 SMALL HEX RETRO
Long, Robert H.; Unpublished; L/W=1.155 H/W=0.843 Vol/W³=0.343 96 index 31+6 facets Invokes triple bounce, avoids head shadow.

Open28.219 SMALLER HEX RETRO
Long, Robert H.; Unpublished; L/W=1.155 H/W=0.779 Vol/W³=0.294 96 index 25+6 facets Good for small and/or dark rough

Open28.220 SMALLEST HEX APEX
Long, Robert H.; Unpublished; L/W=1.155 H/W=0.647 Vol/W³=0.236 96 index 31+6 facets Good for small and/or dark rough

Open28.221 SMALLEST HEX APEX Variation
Long, Robert H.; Unpublished; L/W=1.155 H/W=0.640 Vol/W³=0.236 96 index 31+6 facets

Open28.222 Hexciting Opt
Hamer, John; Personal communication 2017; L/W=1.073 H/W=0.747 Vol/W³=0.270 96 index 65+12 facets

Open28.223 Hextraordinary BCA
Hamer, John; Personal communication 2017; L/W=1.155 H/W=0.671 Vol/W³=0.256 96 index 22+6 facets BCA=Below the Critical Angle

Open28.224 RB Dome BCA
Hamer, John; Personal communication 2017; L/W=1.036 H/W=0.624 Vol/W³=0.213 96 index 49+12 facets BCA=Below the Critical Angle

Open28.225 Chevron Hexagon
Wolkonsky, Alexandre and van Zanten, Piet; Personal communication 2017; L/W=1.155 H/W=0.739 Vol/W³=0.295 96 index 49+6 facets

Open28.226 Cuboctahedron
Ninedorf, Greg; Personal communication 2017; L/W=1.155 H/W=0.944 Vol/W³=0.454 96 index 14+0 facets

Open28.227 The Hex of Exes
Ninedorf, Greg; Personal communication 2017; L/W=1.155 H/W=0.770 Vol/W³=0.314 96 index 79+6 facets For RI 1.54 or greater

Open28.228 Phanvesta 31 - Excaliber
Vlad Tsikhotskyy; Unpublished; L/W=1.155 H/W=0.624 Vol/W³=0.244 96 index 71+6 facets

Open28.229 Excaliber
Phan Tranh Trung; Personal Communication; L/W=1.155 H/W=0.624 Vol/W³=0.244 96 index 71+6 facets Replaces 28.228, Correct designer name

Open28.230 HexCC Trichecker
Van Sant, Fred; Star Cuts V; L/W=1.039 H/W=0.667 Vol/W³=0.225 96 index 60+12 facets

29.001 Diamond Shape
Anon; MDR Book of Gem Cuts, (1949) n13; L/W=1.710 H/W=0.878 Vol/W³=0.446 96 index 41+8 facets