A large Center Carved Onyx Stone dominates this Dweck Ring. The Stone is set in Sterling Silver. Dated 1992 inside shank of Ring. Hallmarked Stephen Dweck / 925. Measures 1.10 x .89 and is a size 6.5 Stephen has long drawn his inspiration from the wealth of materials found in nature. He collects stones from all over the world tourmaline?s from Brazil, boulder opals from Australia, ammonites from Morocco, and pearls from the South Sea. In the past 24 years, he has created an extensive gallery of stones and minerals.