How many classes

How many classes of grade does pearl divide?Sea water pearl and fresh water pearl which the kind is good
International on the market the quality of pearl mainly from the sheen, skin quality, Tahitian pearlshape, size, nacreous thickness, color of pearl, match and drill a hole an etc. factor to make sure;Different nation because of culture and appreciate beauty the difference of aspect, to the understanding of above-mentioned factor importance combine incompletely same, therefore the quality of the pearl the valuation still keep being a work with very strong experience.
Total of to say,Freshwater pearl evaluate is in the sunlight or take white as the background bottom to carry on under the bare light source condition naturally.

Sheen ratings
The pearl is a kind of organic precious stone that has special pearl sheen, the pearl special United States from its special pearl sheen creation of, therefore the sheen of the pearl is the pearl quality most characteristic main factor.Especially farming pearl, other main factors,such as size and shape etc., all can be artificial or part artificial control, the sheen becomes a kind of special index sign more.

The strong or weak of pearl sheen mainly has relevant the growth condition, South Sea pearland water body trace element...etc. of preface degree, pearl with the degree of thickness, nacreous text stone of the nacre or the alignment of the calcite, as a result simply choosing actually and being a kind of outside index sign of nacreous thickness of the pearl is also the embodiment that the female pearl shell grows a healthy circumstance.Generally speaking, the pearl livings water body environment of long-term moderation(general 2~4 years), formation pearl good, the key Kang of the pearl shell the condition is good, the sheen of the pearl more strong;Contrary, the pearl livings to lead for a long time short or the healthy condition of bead shell isn't quite right, the bead shell secretes of Shao amount and qualities of pearl quality are all bad, the sheen of the pearl bad.

The pearl sheen quality measures and has no complete quantity to turn index sign currently.The United States mainly is divided into its four classeses according to its surface reflection image lines clear degree:
The A surface sheen specially bright and even reflection clearly sees as the tallest sheen such as the mirror noodles glint, reflection image lines;
The B sheen clear brightness, image clearly sees as the high sheen.
The c sheen brightness, reflection lines is even but incompletely and clearly sees as in etc. sheen.
The D bead layer is thinner, pearl surface the reflection is misty, weak and asunder see as inferior.

Skin quality ratings
The skin quality is again called skin light or clean degree, clean degree and minor faults, it refers to a pearl surface layer structure fine, delicate and smooth degree, or is the obvious degree of the surface minor faults.

The pearl surface familiar minor faults includes to swell up(pimple), line line, crack, cave pit and black mark, indentation and point of a needle and bead layer peeling off etc., break into abuse among them and peeling off the most serious to the influence of the pearls qualities.

Grow formative pearl in more ideal and healthy environment, its surface is usually fine and smooth.But usually there is various microorganism growth in the sea water of farming pearl, the pearl female shell is in several years of growth process also usually may under the influence of some germs put in the meantime the pit technique may also influence the forming of pearl and its skin quality, therefore the pearl of real completely smooth without blemish is very few.Too many few farmings pearl surfaces all will or many or little take some minor faultses, such as"pimple"s, "waist line", "crease" and"cave pit"...etc..

This kind of minor faults of how much and distribute and then decide the clean degree of the pearl or the quality of the skin quality, also directly influence the pearl quality and the value.Sometimes they also directly influence the possibility that handles to the back of service life and pearl of pearl.

GIA the United States according to having minor faults pearl in a string of pearl of how much, become 4 of the skin quality quality ratings of pearl strings:Golden South Sea pearlThe perfect(FL) and tiny minor faults(have more tiny blemish)(SS), minor faults class(have blemish)(Spotted) and heavy minor faults(have serious blemish)(VS) is four Classes.

Perfect of the pearl(string) mean the surfaces of overwhelming majority pearl in the bead string are all flawless, very few part can the position having minor faults, and distributing limit very much, generally speaking the minor faults of this kind of pearl Be hard to distinguish.

The tiny Xia class pearl(string) means in the middle of the bead string a lot of pearls have no obviously it is thus clear that of minor faults, elaboration observation then can discover that little parts of pearls contain small minor faults.
Little parts of pearls minor faults class pearl(string) means that big parts of pearls all have minor faults, even it is thus clear that obvious minor faults.
The heavy minor faults class pearl(string) means all pearls it is thus clear that minor faults.

The actually above-mentioned standard isn't that the real pearl skin quality ratings is standard, but the ratings norm of the pearl string.Has no widespreadly applied standard to the skin quality the ratings international top of single pearl, but the tower is rare to lift the black pearl has already had a skin quality that widespreadly accepts for the market ratings norm.Can is divided into black pearl according to the skin quality quality the AN and B, C and D is four classes.

A class:Surface without blemish or the individual minor faults canning see without the aid of instruments has the whole epidermis l below 0%, the sheen is very good.
B class:The minor faults seen by naked eye has the whole bead area 1|3 following, and the sheen is better.
C class:The minor faults that naked eye sees at the whole bead area 1|3~2|3 of, the sheen is better.
D class:The epidermis contains more and obvious minor faults, but sheen sink or swim, but the pearl surface is wrapped up by 80% pearl qualities at least.

Actually, currently all circumstances that didn't consider that the minor faults distributes in the skin quality ratings, this is the not enough perfect place.In the actual bargain and the quotation, the minor faults distributes to sometimes have more direct influence on the quality of pearl than the minor faults, if sheen good pearl, have obviously it is thus clear that of minor faults, but its minor faults distributes to limit very much, if only 1| that limits in the orb surface 20 following, its quality is still higher, the reason is what pearl is drilled a hole to inset isn't after its minor faults it is thus clear that, a pearl of contrary same quality such as its minor faults combine not too obvious,Jewellery Manufacturers but dispersal on the whole surface of sphere top or more than 1|2 surface of spheres of pearl, its quality and price will be subjected to serious influence.