| Home | Rough | Bargains | Equipment | Books | Online Designs | Just Ask Jeff | Order | News List | Contact Me | Links |
| Amethyst | Aquamarine | Beryl | Citrine | Emerald | Garnet | Opal | Peridot | Sapphire | Scapolite | Spinel | Sunstone | Topaz | Tourmaline | Quartz | Zircon |
| Beginner's Page | New Stuff | Odds & Ends | Specials | Parcels | Synthetics |
| Cut Gemstones | Gemological Information | Gemstone Pricing Guides | How to buy Gemstones |
Tourmaline (Achroite, Dravite, Rubellite, Indicolite, Verdelite, Siberite)
Crystal Trig Glitter (MC111.JRG)
By Jeff R. Graham
Copyright 2006
84% Light Return
Angles for R.I. = 1.62
76 facets + 6 facets on girdle = 82
3-fold, mirror-image symmetry
96 index
L/W = 1.073 T/W = 0.364 T/L = 0.339 P/W = 0.478
C/W = 0.246 H/W = (P+C)/W+0.02 = 0.744 P/H = 0.643 C/H = 0.330 Vol./W^3 = 0.277Addition # 12 - Cut in refractive indexes 1.62 to 2.14 with no changes. I designed this Trig variation for Aquamarine or any light to medium saturated material. This works in Quartz (41 degrees) although the performance is a little lower (74.8%). Note: C2 tier only meets the girdle at the corners, cutting the tier center point is the easiest way to have even facets.

Random - Cosine - ISO
| Home | Rough | Bargains | Equipment | Books | Online Designs | Just Ask Jeff | Order | News List | Contact Me | Links |