South Sea Pearls
Colour in cultured pearls has many causes, namely organic pigments and the water reservoir where the pearl shell is grown (sea water or freshwater) that has different manganese (Mn) concentrations with impact on nacre's colours. The mollusc species is, of course, one of the most important factors...Q: What is a pearl made of? A pearl is a natural gem created by a living organism. When a foreign object is introduced into a mussel or oyster the animal coats the irritant with a substance called nacre, the same material with which it builds it's shell. Layers of nacre build up to make a pear...Keshi (ケシ), meaning poppy seed in Japanese, was originally used in Japan for very small-sized natural pearls, namely the very rare Akoya natural pearls that were locally collected until the early 20th century. Today, however, the original meaning of the word "keshi" became corrupted and is now a ...