Identification of several types of pearls

In addition to the above seven factors, the value of pearls is also determined by the type of pearl. As we mentioned earlier, pearls have the distinction between natural and cultured pearls, as well as seawater beads and river beads. In addition, although there is no artificial synthetic pearls, there are artificially made artificial pearls (referred to as "imitation beads"). Obviously, these different varieties will have completely different price ranges. Therefore, how to identify them has become the main subject of pearl identification.

One: The difference between natural pearls and artificial cultured pearls Due to the low output of natural pearls and the high price, it is far from meeting the needs of people. Therefore, artificial cultured pearls have emerged. Cultured pearls are divided into seawater pearls and freshwater pearls. Cultured pearls are different from natural pearls due to different conditions such as short growth period:

(1) Different structure: The inner core industry of cultured pearls is artificially made larger shell beads, the outer wrap layer is thin (usually 0.5-2 mm); the inner core of the natural beads is fine sand or parasites, etc. Its outer layer can be extended all the way to the center. If you can cut open the observation, it is not difficult to distinguish.

(2) Different shapes: natural beads are rarely rolled due to foreign matter in the core, so the roundness of the shape is poor; the cultured pearls are round and round, so the roundness after beading is better.

(3) Different skin color: The natural beads are delicate, soft and transparent, and the cultured beads are short in beading time. Therefore, the texture is rough, the gloss is poor, and the transparency is poor.

Seawater pearls, also known as Haizhu and Nanzhu, are distinguished from freshwater pearls in the following ways. You can identify them here:

1. From the shape:

Nanzhu is a seawater pearl that is inserted into the nucleus, and is generally a round pearl. If there are beads that are biased toward the flat garden, they are freshwater pearls.

Because most of the freshwater pearls are non-nucleated, it is difficult to obtain perfectly round pearls, which are generally rice-shaped, oval, and oblate.

Therefore, judging whether a bead chain is south or not, it is crucial to start from the shape.

2. From the top:

The pearl surface of the Nanzhu beads rarely appears with thread-like flaws (even if it is a very shallow thread). The thread of the freshwater beads is common, so once the thread of the special bead chain appears (even if it is a very shallow thread), you can Judging that this bead chain is a freshwater pearl, not the southern pearl.

3. From the feel:

Seawater beads are relatively delicate in their feel, and freshwater pearls have a thicker feel and astringent feel.

4. From the gloss:

In general, the pearl of South Pearl is gorgeous and more transparent than freshwater pearls.

In addition, for the non-exclusive bead chain, in the shape of the beads, the beads that are not round in the south are in the direction of dripping water, and there are few oblate circles.

The biggest disadvantage of freshwater beads: low density. A freshwater pearl shell can produce more than 10-20 freshwater pearls, and can grow from seedless to 7-8mm in two years. Such a rapid growth rate results in a relatively loose bead structure, which is relatively The low density appears on the surface of the pearl. It lacks the firm, delicate and moist texture of the seawater pearl. Compared with Nanzhu of the same grade, Nanzhu's luster is more sharp! Therefore, the luster of freshwater pearls easily fades, and the epidermis is easy to get over. Otherwise, freshwater pearls as non-nuclear pearls are not the present value.

Of course, from the point of view of consumption, pearls are a kind of depletion product. The wearing time of pearls is not differentiated by nucleation or non-nuclear. Although a non-nuclear freshwater pearl chain will not be peeled off, once the gloss fades to a certain degree. The degree will lose the actual wear value. In the case of proper maintenance, the actual aging of a good Nanzhu necklace will never be lower than that of freshwater beads of the same quality.

According to reports, as early as 1656, some people in France produced bead-like beads. This imitation bead is a hollow ball made from work. The balls are filled with sheepskin pulp; the surface is coated with scales extracted from the scales - it produces a pearl-like sheen. For more than 300 years, there have been many different types of imitation beads. However, their basic structure is the same and they consist of artificial cores and nacre-like coatings. It is known that beads of imitation beads are milled with shells and limestone, as well as artificial glass beads or plastic beads. Pearl-like coatings are coated with fish scales, but artificial pearls are also used, such as a white crystal powder of cerium chloride, fine mica powder as the coating material for the main raw materials, and the like. Although there are different types of imitation beads, their identification methods are generally similar. The following table lists the main methods for identifying them. In addition, we can also observe the entire bead string as a whole. The beading beads are very similar to each other, but the pearls are difficult to have exactly the same quality characteristics. In addition, the imitation pearls are used to pay attention to the effectiveness of the production. Sometimes the coating is unevenly coated, and even partially leaked. Afterwards, the coating is applied again, leaving traces of the patch. This situation is not possible in cultured pearls.

The identification method of pearls At present, there are many types of pearls on the market. How do you identify pearls and imitation pearls? Methods as below:

Touch method:

【Pearl】 hand touch cool, cool 【imitation beads】 feel greasy feel bite method:

【Pearl】 tooth bite no smooth feeling, often bump, sand sense [imitation beads] teeth have a smooth sense, bite the coating partially from the intuitive method:

【Pearl】 has a natural multicolored light, in a string of necklaces, its size, shape will also be different [imitation beads] shape mostly spherical, iridescent, glossy very uniform magnification observation method:

[Pearl] The surface has a texture, can see the production state of calcium crystal [imitation beads] can only see the eggshell-like more uniform coating bounce method:

【Pearl】 Drop the pearl from the height of 60cm on the glass, and rebound 35cm [imitation beads] under the same conditions, the anti-jumping solution of the imitation beads solution soaking method:

【Pearl】When placed in ** solution, the brilliance is as usual [imitation beads] under the same conditions, only 1 minute, the gloss is lost