COLLECTION OF GEMSTONE AND DIAMOND RINGS Consisting of a ring containing one oval cabochon boulder opal and four round brilliant cut diamonds, together with a ring containing one emerald cut bicolor tourmaline and six round brilliant cut diamonds. Mounted in yellow gold. Ring sizes 6 1/4 and 6 1/2. Opal ring stamp: 14K (obscured maker's mark). Tourmaline ring stamp: T-R 14K. 5.40 dwt.