Art Deco Style Black Onyx and Sterling Silver Square Bead Necklace

This elegant statement necklace consists of uniform square-shaped black onyx beads strung individually with round onyx spacer beads. Based on the provided context, the item features sterling silver components and a specialized onyx-inlaid clasp. The onyx displays a deep, consistent jet-black hue with a high-polish vitreous luster, characteristic of quality chalcedony. The geometric square beads reflect an Art Deco aesthetic, emphasizing clean lines and monochromatic contrast. The construction appears to be professional-grade, with the small spacer beads providing necessary flexibility for the drape. While the exact length is not specified, it is displayed as a matinee or opera length piece. The overall condition appears excellent with no visible chips or fractures to the stone edges. The sterling silver elements likely possess a hallmark, though not visible here. This piece likely dates from the late 20th century to contemporary, imitating early 20th-century mourning jewelry or high-fashion Deco motifs. The use of a matching onyx clasp indicates a higher level of artisanal craftsmanship and attention to detail than mass-produced costume jewelry.