Amethyst
In materials with RIs lower than 1.76, like quartz, classic Portuguese cuts may create a dead area in the center of the stone. 14k white gold ring with a 4-ct, Portuguese-cut amethyst and round, full-cut diamond accents. Photo courtesy of liveauctioneers.com and Ahlers & Ogletree Auction Gallery.
Article: How to Cut a Simple Portuguese Gem Design
Credit: Ahlers & Ogletree Auction Gallery
| Gemstone | Quartz, Amethyst |
| Natural or man made | Natural |
| Carat Weight | 4 |
| Jewelry type | Ring |
| Gem State | Faceted |
| Color | Purple |
| Transparency | Transparent |