Brian Gavin is probably better known for his custom diamond jewelry but he also offers some very lovely pre-made jewelry in a variety of materials.
This ring is set with a 4.48 carat cushion cut amethyst, set in a textured 14k gold band accented with diamonds, .04 carats worth. Though this is not made by Gavin, the site notes, “Supplied by approved outside vendors who have passed our strict quality control process. Selection is based on design, quality of materials, and price for the product.”
It sells for USD$695.