* What is the pearl?　　
The pearl is some shellfishes, because of entering in the ocean or the fresh water (put while being artificial ) , internal exotic is it stimulate to grit but body pearl liquid of endocrine wrap up the exotic ring upon ring but round cylinder that formed. Because the form of the pearl is graceful , the color is pleasant, the gloss is soft , sparkling and crystal-clear and brilliant, character is graceful, make people add romantic charm, right away take the fancy of people since ancient times and appreciation, and has always equated with gem, but because most gems and malachite are all nonmetal form mineral or mineral aggregate, the pearl is not the mineral, then, in most gem works, the pearl is arranged at the back, it is not that mineral and gem are associated with with minority , such as amber , coral and jet ,etc., have a few gem work wave pearl chapter one in each too, if Hong Kong Zhang WenJi " world jewel " of Mr. book belong to this kind.

＊How to maintain the pearl ornament?
　　The pearl ornament is a more advanced ornament , can keep for a long time , even pass on from generation to generation. But because the pearl surface is relatively soft, easy to damage, and because its backbone is the calcium carbonate, it is easy to be corroded to meet the acid. So, should use carefully , pay attention to maintaining. 1, While wearing: Unsuitable to wear the coarse cloth dress , should avoid keeping in touch with sour vinegar , alcohol and perfume , so as not to soak but make the pearl fade or tarnish.
2, When not using: Should wash with the rare toilet soap water first , and then wash netly with the branch water. Put cotton flannel or silk fabric , in the jewel box of silk , and unsuitable to put in plastic bag or plastic box sealing keeping at cushion, so as not to influence its gloss.
3, Find it when the pearl turns yellow: As the saying goes: " in the sear and yellow ". Some have already been worn or preserved the pearl ornament of the above for decades by ancestors , yellow that may become dim . Still limited to the pearl in the top layer in turning yellow, the available density soaks it slightly for 10% of the rare hydrochloric acid, with the production of the foam, the yellow outer cover of the pearl is dissolved, the pearl can present radiance again . But is it pay special attention to to want, don't in soak too long in being rare and sour, in case pearl destroy.

*Variety of the pearl
　　Actually the pearl (Pearl ) referred to the natural pearl, but the one that nearly all sell on the market now was the cultured pearls, it is simple, a lot of businessmen call cultured pearls pearls. When people refer to Pearl , namely refer to the cultured pearls, I only represent the cultured pearls and natural pearl by pearl here. On the whole, the pearl can be divided into the salt water and pearl and two big classes of fresh water and pearl . Salt water pearl bank up with earth that bone come out among sea, ocean, bay, little oyster that bay produce, such as the Japanese pearl , the South China Sea pearl. The fresh water and pearl are produced in the mollusk in the river , lake, the form mostly differ. The following are the daily names of all kinds of pearls. (Very many distributors use the name of producing area of the pearl to describe the characteristic of the pearl of this place, the pearl with a certain characteristic has been known as the pearl produced in so-and-so place too gradually. )