The Hope Pearl AND the Hope Diamond. Quite a major gem collection.
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Historically, gem materials of a biological origin were called organic. The term organic can be confusing as a definition by itself because of its use as a clarifying word for natural substance that has had no additional chemical intervention.
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Nacreous pearls are the pearls that we mostly talk about and see. These are the South Sea Pearls, Tahitians, and Freshwater Pearls. Non nacreous pearls are grown in conch shells. There are many varieties, but the main ones are the Conch Pearls and the Melo Melo Pearls.
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