Oysters are bivalves, which means that its shell is made of two parts, or valves. The shell's valves are held together by an elastic ligament. This ligament is positioned where the valves come together, and usually keeps the valves open so the oyster can eat.
These are the parts of an oyster inside the shell:
As the oyster grows in size, its shell must also grow. The mantle is an organ that produces the oyster's shell, using minerals from the oyster's food. The material created by the mantle is called nacre. Nacre lines the inside of the shell.
The formation of a natural pearl begins when a foreign substance slips into the oyster between the mantle and the shell, which irritates the mantle. It's kind of like the oyster getting a splinter. The oyster's natural reaction is to cover up that irritant to protect itself. The mantle covers the irritant with layers of the same nacre substance that is used to create the shell. This eventually forms a pearl.
So a pearl is a foreign substance covered with layers of nacre. Most pearls that we see in jewelry stores are nicely rounded objects, which are the most valuable ones. Not all pearls turn out so well. Some pearls form in an uneven shape -- these are called baroque pearls. Pearls, as you've probably noticed, come in a variety of various colors, including white, black, gray, red, blue and green. Most pearls can be found all over the world, but black pearls are indigenous to the South Pacific.
Cultured pearls are created by the same process as natural pearls, but are given a slight nudge by pearl harvesters. To create a cultured pearl, the harvester opens the oyster shell and cuts a small slit in the mantle tissue. Small irritants are then inserted under the mantle. In freshwater cultured pearls, cutting the mantle is enough to induce the nacre secretion that produces a pearl -- an irritant doesn't have to be inserted.
While cultured and natural pearls are considered to be of equal quality, cultured pearls are generally less expensive because they aren't as rare.
10 FASCINATING FACTS ABOUT PEARLS
Pearls are the only jewels created by a living animal. A natural pearl of value is found in less than 1 in every 10,000 wild oysters.All pearl oysters are born male and transform into females at around three years of age.There are three major types of saltwater cultured pearls: Akoya, Tahitian and South Sea. These pearls account for approximately 5% of the total weight of global pearl production. Although they share many of the same characteristics, they can look vastly different as each pearl is sourced from a different species of oyster. These oceanic oysters typically grow only one pearl at a time.Freshwater pearls account for approximately 95% of total global pearl production but are much less valuable than saltwater pearls. China produces the overwhelming majority of freshwater pearls in pearl farms that may range from a farmer's fishpond to massive lakes filled with over a million mussels. A single freshwater mussel will typically produce between 30 and 50 pearls at a time. Even with cultivation practices, South Sea pearls are incredibly rare. By way of comparison, the weight of diamond production each year is about 10 times greater than the weight of the annual Australian South Sea pearls harvest. Pearl oysters are also used for their shell (known as mother-of-pearl) and their meat.The earliest record we have of pearls as precious objects are artefacts from Mesopotamia dated to around 2300 B.C.Recently, a two thousand year old pearl was found in an Australian Aboriginal archaeological dig in the Kimberley region of Western Australia.La Peregrina (Spanish for ‘the incomparable’) is one of the most famous pearls in the world. The 500-year-old pearl is pear shaped and the size of a large pigeon’s egg. Its previous owners included a King of Spain, Napoleon Bonaparte and Elizabeth Taylor.In the early days, pearl divers regularly faced the threat of shark attacks as well as the dreaded crippling effects of the bends with every dive. In the late 19th Century and early 20th Century, the mortality rate for divers was as high as 50 per cent. Today, there are strict protocols and regulations regarding occupational diving to reduce these risks.
#originalpearls #pearl #pearls #necklace #pendant #jewelry #kalungrhodiummutiaralaut #pearlnecklace #mutiaralaut #rhodiumnecklace #kalungmutiaralautmurah #original #southseapearl #kalungmutiaralaut #delhi #bangalore #pune #hyderabad #pearljewelry #freshwaterpearl #hyderabadpearls #madebyorder #madebyorderonly #instanature #baroquepearl #neclaces #baroquepearlnecklace #handmade #baroques #bhfyp