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Pearl

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Pearl is a hard, rounded formation extracted from the shells of some molluscs . Valuable as a gem and used to make jewelry . Pearl is formed inside a clam shell as a result of being hit there is a foreign object (grains of sand, etc.). Pearls are classified according to their place of origin, that is, they can be both marine and freshwater . And also differs in the way of origin on natural and cultivated . Marine harvest pearl is mainly found in the Red Sea and the Persian Gulf, as well as off the coast of Sri Lanka and Japan, where it is obtained by ama divers. Freshwater pearls are mined in Germany, Russia, China and North America.

Quality classifier pearls , most commonly used in Europe looks like this:

  • quality A: dull gloss, mother-of-pearl layer within 0.5 mm., irregular shape, diameter less than 10 mm., many visible defects;
  • quality A +: dull gloss, mother-of-pearl layer within 0.5 mm, irregular shape, diameter less than 10 mm, a significant part of the surface is defective;
  • quality A ++: moderate gloss, mother-of-pearl layer within 0.5 mm., irregular shape, diameter less than 10 mm., the surface has visible defects in a small amount;
  • AA quality: good gloss, mother-of-pearl layer up to 1 mm., the shape is close to spherical, any diameter, the surface has barely visible defects on almost every pearl;
  • quality AA +: very good gloss (minimum of cloudy spots), a thick layer of mother-of-pearl, not chipped off upon impact, almost spherical, no more than 5% of visible surface defects (in this case, pits, chips, grooves);
  • kaEssence AA ++: excellent gloss, thick layer of mother-of-pearl, not chipped off upon impact, almost spherical shape, no more than 5% of visible surface defects (in this case - pits, chips, grooves);
  • AAA quality: gem quality, for such pearls a certificate is required (conclusions of a gemologist based on X-ray and spectroanalysis) for each thread / a pearl . Products made from such pearls from a distance look like glass, have a dazzling shine and perfect shape, the thickness of mother-of-pearl in them is at least 1-1.5 mm.

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