Vintage 925 Sterling Silver Black Onyx Marcasite Brooch Pin Thailand Art Deco

Beautiful vintage sterling silver brooch featuring a large polished oval black onyx cabochon surrounded by intricate floral filigree and sparkling marcasite accents. A substantial statement piece with an elegant Art Deco / Victorian Revival look. - Stamped: 925 CI THAI - 925 sterling silver - Large polished black onyx center stone - Marcasite accents - Ornate floral and filigree design - Traditional pin-back closure - Made in Thailand - Approx. 2¼" wide × 1¾–2" tall - Vintage pre-owned condition with light age-related patina/wear The black onyx remains glossy and striking, and the detailed silverwork gives the piece beautiful dimension and sparkle. Please review all photographs, including close-ups of the hallmark, back, pin mechanism and measurements, as they are part of the description.