Ruby Pearl Diamond Bangle 18

Ruby Pearl Diamond Bangle 

By Aamir Mannan.
The nucleus bead in a beaded cultured pearl is generally a polished sphere made from freshwater mulyst for the pearl sac, it is surgically implanted into the gonad (reproductive organ) of a saltwater ssel shell. Along with a small piece of mantle tissue from another mollusk (donor shell) to serve as a catamollusk. In freshwater perliculture, only the piece of tissue is used in most cases, and is inserted into the fleshy mantle of the host mussel. South Sea and Tahitian pearl oysters, also known as Pinctada maxima and Pinctada margaritifera, which survive the subsequent surgery to remove the finished pearl, are often implanted with a new, larger beads as part of the same procedure and then returned to the water for another 2–3 years of growth.

Gold Zarcan Ruby Emerald Set 17

Gold Zarcan Ruby Emerald Set

By Aamir Mannan.

A shell of the Indian volute, Melo melo, surrounded by a number of pearls from this species

Biologically speaking, under the right set of circumstances, almost any shelled mollusk can produce some kind of pearl, however, most of these molluskan pearls have no luster or iridescence. The great majority of mollusk species produce pearls which are not attractive, and are sometimes not even very durable, such that they usually have no value at all, except perhaps to a scientist or collector, or as a curiosity. These objects used to be referred to as "calcareous concretions" by some gemologists, even though a malacologist would still consider them to be pearls. Valueless pearls of this type are sometimes found in edible mussels, edible oysters, escargot snails, and so on. The GIA and CIBJO now simply use the term 'pearl' (or, where appropriate, the more descriptive term 'non-nacreous pearl') when referring to such items and, under Federal Trade Commission rules, various mollusk pearls may be referred to as 'pearls', without qualification.