Art Nouveau silver and abalone shell brooch

This is a decorative circular brooch featuring an Art Nouveau design, displayed against a neutral textured carpet background. The piece is crafted from a silver-toned metal, likely sterling silver based on the soft reflective patina, though no hallmarks or maker's marks are directly readable from this angle. The primary background of the brooch consists of a vibrant, iridescent abalone or mother-of-pearl inlay displaying deep amber, green, and golden-yellow hues with a highly chatoyant, mottled pattern. Overlaid centrally on the iridescent panel is an openwork silver frame shaped like a stylized, lobed flower. At the exact center of this overlay is a small, round, bezel-set yellow or amber-colored stone or glass cabochon. The outer circular border of the brooch has a gently undulating, scalloped edge with four small decorative points or claws holding the central elements in place. The overall condition appears well-preserved with a natural dark tarnish visible in the recesses of the metalwork, consistent with vintage or antique costume and artisan jewelry. The aesthetic characteristics strongly suggest a mid-century or early 20th-century Arts and Crafts or Art Nouveau stylistic influence, though the lack of visible stamps means the attribution rests solely on stylistic visual evidence rather than a confirmed maker's mark.

Based on what I can see in the photograph, this circular brooch displays aesthetic characteristics suggestive of early 20th-century Arts and Crafts or Art Nouveau stylistic influence, featuring an iridescent abalone inlay and a stylized silver-toned metal overlay. However, I can't verify from a photo whether the metal is solid sterling silver or base metal with silver plating, as no hallmarks or maker's marks are discernible from this angle. A physical inspection would need to be conducted to test the metal composition and evaluate the setting of the central cabochon. My appraisal value estimate of $150 to $300 assumes the hypothesis that the piece is a period-authentic artisan creation fitting these stylistic parameters. General market demand for vintage Arts and Crafts or Art Nouveau costume and artisan jewelry remains steady among collectors of period accessories, though values fluctuate based on material quality and attribution. If physical examination were to reveal that the item is a later reproduction, a modern copy, or merely made 'in the style of' the period rather than being a vintage piece, the value would likely decrease significantly, falling into the $40 to $80 range. To establish a more precise evaluation and attempt to confirm authenticity, I would recommend in-person examination by a qualified jewelry specialist, hallmark verification under magnification, and potentially non-destructive metal testing.