Spinel
Rubies and spinels may show similar colors. One of the simplest ways to distinguish these gems is to test for double refraction with a dichroscope. Since spinels have an isometric crystal structure, they have no double refraction. On the other hand, rubies do have double refraction. Brilliant-cut oval spinel, 6.88 cts, recut by AGTA Spectrum Award-winner Mark Kaufman. Mogok gem tract, Myanmar. © Rob Lavinsky, www.iRocks.com. Used with permission.
Article: Table of Refractive Indices and Double Refraction of Selected Gems
Credit: www.iRocks.com
Gemstone | Spinel |
Natural or man made | Natural |
Origin | Myanmar |
Origin details | Mogok gem tract |
Carat Weight | 6.88 |
Height | 12 |
Width | 10 |
Depth | 7 |
Gem State | Faceted |
Color | Purple |
Transparency | Transparent |