06.018 Spinel Cushion

  • Upson, Frank A;Faceter's Gem Cuts, (1977) v2 n55;
  • L/W=1.25
  • H/W=0.756
  • Vol/W^3=0.469
  • 27+4 Facets
  • Gear: 64
8 16 24 32 40 48 56 <64> W W U U L L T T C C P P PC 06.018 Spinel Cushion Upson, Frank A: Faceter's Gem Cuts (1977) v2 n55 Angles for R.I. = 1.540 27 facets + 4 girdles 2-fold, mirror-image symmetry; 64 index L/W = 1.250 T/W = 0.734 U/W = 0.487 P/W = 0.429 C/W = 0.306 Vol/W³ = 0.469 pc06018.asc