
A pearl is a hard object produced within the soft tissue
(specifically the mantle) of a living shelled mollusk or another animal, such
as a conulariid. Just like the shell of a mollusk, a pearl is composed of
calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in
minute crystalline form, which has been deposited in concentric layers. The
ideal pearl is perfectly round and smooth, but many other shapes, known as
baroque pearls, can occur.
The Abernathy Pearl

The Abernathy pearl was discovered in the River Tay in1967 by a
professional pearl diver by the name of Bill Abernathy (hence its name and
nickname). The pearl was found in an odd-shaped mussel, common to the River
Tay.
The Scottish have searched their abundant rivers for centuries
seeking prized pearls. Freshwater pearls were indeed found in abundance until
the Industrial Revolution polluted the waterways and wreaked havoc on the pearl
producing mussel populations. The Abernathy was displayed for nearly 30 years
in a jewelry store in the city of Cairncross until it was sold for undisclosed
sum in 1992.
The Arco Valley Pearl

The Big Pink Pearl
Valued in 1991 at $4.7 million US dollars, the Big Pink Pearl is
listed in the Guiness book of World Records as being the largest natural
abalone pearl ever found. This baroque gem weighs a full 470 carats.
The purported owner of this gem is Wesley Rankin, who found the
pearl while diving at California's Salt Point State Park in Petaluma California
in 1990.
The Gogibus Pearl
This pear-shaped pearl was the largest know pearl discovered
during the early 17th Century off the coast of the West Indies. The gem weighs
a hefty 126 carats. It is said that King Philip IV purchased this pearl from a
merchant name Gogibus who wore the pearl as a button in his cap in 1620.
The Hope Pearl

Currently residing in the British Museum of Natural History, the
Hope Pearl was once owned my Henry Philip Hope, the one-time owner of the Hope
Diamond.
The Huerfana (Spanish: The Orphan)
The Huerfana was one of the most splendid gems of the Spanish
Crown Jewels. Remarkably, it has been reported that this large pearl was not
discovered within an oyster, but found in a shell bed in the Gulf of Panama.
The Huerfana was a remarkable pearl because of its perfect shape,
large size, and brilliant luster, and was once owned by Doña Isabel de
Bobadilla, the first female governor of Cuba. The Huerfana was reported to have
been destroyed, when the Spanish palace burned in the 18th century.
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