Ring #133 (shown in amethyst) is available in the following natural gemstones:

Amethyst Aquamarine Blue Topaz Citrine Garnet Iolite Opal (blue-green) Opal (white) Peridot

Price $31.00.  Available in sizes 4-9.
All rings are available in half and quarter sizes. All rings come in a free decorated gift box.