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Clyde Duneier, known by his maker's mark CID, was an American jewelry designer active primarily in the mid-to-late 20th century. His work is characterized by modernist designs featuring geometric shapes and semi-precious stones, particularly onyx. These pieces represent the American studio jewelry movement that emphasized clean lines and quality craftsmanship. Vintage CID jewelry appeals to collectors of mid-century modern design and those seeking unique, handcrafted pieces. The combination of sterling silver with black onyx creates a timeless aesthetic that remains popular in contemporary fashion.