Art Deco marquise cocktail ring

This piece is a striking vintage ring featuring an elongated marquise or navette-shaped silhouette, showcasing a vibrant blue central stone securely bezel-set within an intricate white metal mounting. The bright blue stone is faceted with a step-cut or table-top appearance, displaying a deep cerulean hue. Surrounding the central stone is a highly detailed, textured metal framework featuring hand-engraved milgrain accents, repeating chevron or feather-like geometric patterns, and openwork galleries typical of mid-20th-century costume or fine jewelry design. The white metal exhibits a slightly aged patina, particularly within the recessed decorative channels, hinting at silver or rhodium-plated base metal. There are no visible hallmarks, maker's marks, or stamps discernible in the provided image. The overall aesthetic is consistent with the Art Deco revival style of the mid-20th century, characterized by symmetry, geometric motifs, and a dramatic cocktail ring presence. Condition appears generally good with minor surface wear and patina appropriate for an older, unauthenticated piece of costume jewelry.

Based on what I can see in the provided image, this piece is an Art Deco revival style marquise cocktail ring featuring a vibrant blue central stone and detailed white metalwork with milgrain accents. I cannot verify the exact metal composition, stone origin, or age from a photo alone, and would need physical inspection to confirm whether the piece is fine jewelry or quality costume pieces. The estimated value range of $150 to $300 assumes the item aligns with mid-20th-century costume or vintage fashion jewelry of this type. General market demand for vintage cocktail rings remains steady among collectors of period style accessories, though unauthenticated items without maker's marks typically trade on aesthetic appeal rather than intrinsic material value. Should this item turn out to be a modern reproduction, replica, or made strictly in the style of Art Deco rather than a period piece, the value would likely decrease closer to $30-$75. To establish a more precise evaluation and assess authenticity, an in-person examination, hallmark verification, and metallurgical testing by a qualified specialist would be required.