Ring with spherical orb in a brutalist-style mount

This item is a ring featuring a prominent, translucent spherical orb set into a metallic mount. The orb appears to be composed of glass or a polished mineral, displaying internal inclusions and light refraction consistent with materials like moonstone or cat's eye glass, though its exact composition is unverified from the image. The setting is a wide, sturdy band with a smooth finish, exhibiting a dark tone consistent with tarnished sterling silver or a base metal with an antiqued patina. The design is stylistically consistent with mid-to-late 20th-century brutalist or modernist jewelry, characterized by bold, sculptural forms and a focus on raw, oversized elements. There are no visible hallmarks, maker's marks, or signatures in the provided photo, and the item shows surface wear, minor scratches, and darkening of the metal associated with age or frequent handling. Due to the lack of legible markings, any attribution to a specific designer or metal purity is based on visual style alone and would require physical testing for confirmation.

Based on my visual analysis of the provided image, I have evaluated this ring which displays characteristics of mid-20th-century modernist or brutalist design. The piece features a prominent, translucent spherical orb set into a wide, heavy mount with an antiqued patina. While the metal appearance suggests tarnished silver or a base metal alloy, I cannot verify the metal purity or the exact mineral composition of the orb from a photo alone; it bears a resemblance to moonstone, cat's eye glass, or polished quartz. The value estimate of $150-$350 is based on the assumption that the item is a handcrafted artisan piece of the period, likely in sterling silver. Because there are no visible hallmarks or maker's marks, this attribution remains a hypothesis. The market for mid-century sculptural jewelry remains steady, with demand driven by collectors of bold, statement pieces. However, without physical testing to confirm the silver content or an in-person examination by a gemologist to identify the orb material, the value is speculative. Should the item be determined to be a base-metal reproduction or a more contemporary piece 'in the style of' the brutalist movement, the value would likely decrease to the $40-$75 range. To provide a more accurate valuation, a physical inspection is required to check for hidden marks, perform a professional acid test for metal fineness, and utilize refractometry to identify the stone. Establishing provenance or finding a mark consistent with a known studio jeweler would significantly enhance the item's marketability.