Vintage Art Deco Style Frosted Rock Crystal and Diamond Ring

This is a vintage cocktail ring, likely dating from the 1920s-1940s Art Deco or Retro period, or a high-quality later reproduction in that style. The focal point is a large, vertically oriented oval frosted rock crystal (or glass) camphor-style stone. The stone features deep reverse-carved radial lines emanating from the center, creating a sunburst or 'star' effect. Centrally mounted atop the crystal in a lozenge or diamond-shaped white metal frame is a small round-cut accent diamond, held in place with milgrain-beaded edges. The entire center assembly is encased in a scalloped, elongated oval bezel with four distinct x-motif or floral accents at the primary compass points. The setting appears to be white gold or platinum, though silver is possible; it exhibits a bright, polished finish with minimal tarnishing. The shank is a simple, slender round band that merges cleanly into the decorative head. Condition appears excellent with the crystal face showing no significant chips or surface scratches. The craftsmanship is refined, indicative of mid-20th-century fine jewelry manufacturing techniques.