Pearl Education

Pinctada albina (Lamarck, 1819)

Distinguishing Characteristics

P. albina is known as the smaller Australian Oyster. In the 1960's, studies revealed that there were local differences between the color and size of the shell. Because the differences were determined to be geographical discontinuities, the species was divided into two subspecies: P. albina albina (Lamarck) and P. a. sugillata (Reeve), which represent the western and eastern subspecies.
The species is small, only three to four...

Natural Pearls Defined
Natural pearls are calcium carbonate secretions which form within mollusks without human intervention.

Natural Pearls Accidents of Nature
Natural pearls are formed randomly and really are simple accidents of nature. When a certain type of irritant, such as a parasite, becomes lodged in the tissue of a mollusk, the animal responds by secreting a calcium carbonate substance called nacre to coat the intruder and protect the mollusk. Over a period of several years, this...

Melo Melo Pearls Defined
A melo melo pearl is a non-nacreous, natural calcareous concretion produced by the marine volute gastropod melo melo.

Melo melo shell (from Wikipedia)

Melo Melo Pearls are Non-nacreous or "Porcelaneous Pearls"
The melo melo "pearl" does not come from an oyster or mussel, but comes instead from the "melo melo" marine snail, which is found in the waters of the South China Sea, as far south and west to Singapore and Andaman Sea. Like conch pearls, the melo melo gem is...

Conch Pearls Defined
A Conch Pearl is a non-nacreous, porcelaneous pearl produced by the "Queen Conch" (Lobatus=Strombus gigas). "Conch pearls" -also known as "jellybeans" in the trade- often exhibit a unique flame-like pattern due to their concentrically arranged calcium carbonate platelets, arranged in a lamellar fashion. This beautiful optical effect is much harder to say and understand than to admire: the pearls seem to have "tongues of fire" within their interior.

A closeup of a Conch...

Abalone Pearls Defined
Abalone Pearls are natural pearls found in the gastropod mollusk Haliotis. The shells and pearls are most often an iridescent blue color, and the most common shape for pearls are baroque and "horn".

Abalone Shells from Mexico and the United States

Abalone Pearls: Some of the Most Beautiful Pearls in the World
Abalone pearls are considered by many to be some of the most beautiful pearls in the world, and they are also some of the rarest. Abalone pearls come from the...

South Sea Pearls Defined

A South Sea pearl is pearl produced by the Pinctada maxima mollusk. They are currently cultured in areas throughout the Indian and Pacific Oceans, primarily in Australia, the Philippines, Indonesia and Myanmar.

South Sea Pearls - Among The Largest In The World

South Sea pearls are among the largest commercially harvested cultured pearls in the world. The average size of a South Sea pearl is 13 mm, with most harvests producing a range of sizes from 9 mm to 20 mm...