Black Conch Pearl (also known as a Non-nacreous Pearl)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Strombidae, Genus: Aliger (formerly Strombus), Species: Aliger gigas · Strombidae (Conch Family) · Pearl (Biological byproduct of a Gastropod). It is a non-nacreous calcareous concretion, not a shell itself. Shape is spherical/ovoid.
Species
Most likely Strombus gigas (now Aliger gigas) or Melongena corona. Confidence: 85% for a Queen Conch-related origin.
Shell Type
Pearl (Biological byproduct of a Gastropod). It is a non-nacreous calcareous concretion, not a shell itself. Shape is spherical/ovoid.
Family
Strombidae (Conch Family)
Size
Approximately 5-6mm in diameter. This is a small specimen; conch pearls typically range from 2mm to 15mm.
Color & Pattern
Deep obsidian black to extremely dark chocolate brown. It exhibits a porcelain-like luster rather than the pearly iridescence of nacre. No 'flame' pattern is visible, which is common in darker conch pearls.
Rarity
Extremely Rare. It is estimated that only 1 in every 10,000 to 15,000 conchs produces a pearl, and only 10% of those are gem quality.
Habitat
Found within the mantle of the living mollusk. The host species (Queen Conch) typically inhabits seagrass beds and sandy bottoms at depths of 1 to 30 meters.
Geographic Range
Caribbean Sea and Western Atlantic, ranging from Bermuda to Brazil and including the Gulf of Mexico and the Florida Keys.
Description
A rare, non-nacreous pearl produced by a conch. Unlike oysters, conchs produce pearls made of calcium carbonate fibers. This specimen is a strikingly dark, nearly perfectly round sphere with a smooth, glossy surface and high luster.
Key Features
Opaque black color, spherical shape, lack of typical 'flame' pattern (often hidden in black specimens), porcelain-like surface, and small size.
Collector Value
Highly desirable and valuable. While pink conch pearls are more famous, black specimens are a niche find for collectors of rare biological gems. Estimated value for this size/shape: $200 - $600 USD.
Condition Notes
Excellent condition based on surface luster. No visible cracks or pitting. Collectibility grade: Gem (Natural).
Interesting Facts
Conch pearls cannot be cultured; every one found is 100% natural. Black pearls from conchs are significantly rarer than the famous pink or peach-colored versions. Historically, they were prized in Victorian mourning jewelry.
Ecological Role
The pearl is a defensive byproduct of the mollusk to encapsulate an irritant (like sand or a parasite). The Queen Conch is currently protected under CITES Appendix II due to overfishing.
Similar Species
Sea Urchin spines (tumbled), Sea Glass (black), or Opercula from small snails. Distinguishable by the uniform density and lack of growth rings or attachment marks.
Beach Finding Tips
Finding a conch pearl on a beach is nearly impossible. They are almost exclusively found by fishers cleaning conchs for meat or by divers.