14K yellow gold with Blue Topaz “R” 6.04ct 12mmx10mm Oval CB w/Diamonds .16ctw Ring. Stamped with “14K STN”.
This gem actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. The colorless appearance of this gem is plentiful, and is often treated to give it a blue color. It is also pleochroic, meaning that the gem can show different colors in different crystal directions.