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Pearl as talisman Pearls. Amongst all nations Pearls have ever been considered the most beautiful products of Nature, but having their origin in a living organism cannot be called a precious stone. Most scientists are agreed that Pearls are formed in the endeavour of certain bivalves to obtain relief from the irritation caused by some [...] Before proceeding to the study of precious stones as individual gems, certain physical properties common to all must be discussed, in order to bring the gems into separate classes, not only because of some chemical uniformity, but also because of the unity which exists between their physical formation and properties. The first consideration, therefore, may [...] |
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