Vintage Mother-of-Pearl Rectangular Brooch

This is a vintage rectangular brooch crafted from iridescent mother-of-pearl (nacre). The piece features a soft, rectangular shape with rounded corners and a slightly convex surface that catches the light to reveal a pearlescent luster typical of high-quality shell material. Coloration ranging from milky white to subtle silver and champagne hints is visible across its chatoyant surface. The construction appears to be a solid slab of shell, indicating a mid-20th-century aesthetic, likely from the 1940s to 1960s. A visible pin stem is seen on the left side, appearing to be integrated with a simple hinge and C-clasp on the reverse. The item shows light scratches consistent with age and use, though its edges remain relatively smooth without significant chipping. The craftsmanship is clean, focusing on the natural organic patterns of the shell rather than ornate metalwork. No maker's marks or stamps are visible from this angle, suggesting it may be a boutique or handmade artisan piece. The overall quality is characteristic of classic mid-century organic costume jewelry, emphasizing the raw beauty of natural materials.

Upon visual examination of this vintage mother-of-pearl rectangular brooch, I find it to be a well-preserved example of mid-century organic costume jewelry, likely dating from the 1940s to 1960s. The material displays high-quality chatoyancy with desirable champagne and silver overtones. The condition is professionally graded as 'Good to Very Good'; while minor surface abrasions are present, the absence of delamination or significant chipping at the corners maintains the structural integrity and aesthetic value of the nacre slab. The market for mid-century organic materials remains stable, though value is currently driven more by 'boho-chic' fashion trends than by collector rarity. Comparables for unsigned, artisan-style shell brooches of this size typically realize prices in the $40 to $80 range at boutique vintage outlets. The lack of a maker’s mark suggests a boutique or hand-finished origin rather than a high-end house like Michaud or Boos, which caps the premium potential. Factors impacting value include the quality of the C-clasp and the iridescence of the shell. A major limitation of this digital appraisal is the inability to verify the security of the pin-back mounting or to confirm if the shell is a solid slice or a high-quality laminate. To provide a definitive valuation, an in-person inspection is required to test the metal composition of the pin stem and ensure no hidden hairline fractures exist. Provenance documentation regarding the artisan's origin would also be necessary to elevate this piece into a higher 'collector' tier.