To distinguish K-gold diamond rings, we must first distinguish diamonds, and then K-gold. The specific methods and steps are as follows:

First, pay attention to the luster and dispersion of gems.

Diamonds should have a typical diamond luster. According to the dispersion of diamond (0.044), the standard cut diamond should show obvious "fire color", but the common synthetic diamond-like products (such as cubic zirconia, strontium titanate, yttrium aluminum garnet, etc.); Hellip is more dispersed and presents more obvious "fire color". Seen from the crown, this imitation diamond, which has undergone standard cutting and polishing, emits seven colors of light, while the "fire color" of diamonds generally only emits two kinds of light: blue and orange.

Second, pay attention to some appearance characteristics of diamonds.

1. Because the hardness of the diamond is very high, there should be no scratches on the surface of the diamond. The hardness of substitute diamonds is not as good as that of diamonds, so scratches often appear on the surface.

2. Because of the high refractive index of diamond (2.4 17) and excellent cutting, when the finished diamond table is upside down on a character, the character cannot be clearly seen from the pavilion, which is called "word reading"; If the diamond table is inclined to the observer's side, the side of the gem pavilion opposite to the observer's line of sight can not be seen from the table, which is called "dark window method"; Put the diamond table upside down in the glassware, and add water to the height corresponding to the position of the bottom tip of the diamond, so that the bottom tip can be vertically irradiated by the convergent light source. When the container is far away from the lower object for a certain distance, you can see a radiated image on the background of the lower object. The radiated light is far away from the central light range. Unlike the images of other gems, the light and light fields are intertwined, which is called "looking at the picture".

3. Observe whether there are original marks such as etching, cleavage plane and growth line on the waist of the unpolished diamond with a magnifying glass of 10 times. Most diamonds have tiny flaws under the magnifying glass of 10 times, which is different from the cleanliness of substitute diamonds.

Third, pay attention to some auxiliary identification features of diamonds.

Have the following characteristics, although the identification result cannot be directly obtained, it can achieve the purpose of prevention. Functions mainly include:

1. Pay attention to the "volume-price ratio" of diamonds. The basic characteristics of diamonds are small size and high price. If not, you should pay attention. If you spend 3000 yuan on a diamond weighing 400mg(2ct), you should be suspicious.

2. Pay attention to some features left by diamond processing technology. These features are caused by some features of diamond and special diamond cutting, mainly including: straight and sharp edges, no burr (occasional crystal surface defects or cracks); Facets are well connected, the corners are sharp, and there is no hump or tip collision; The alignment of the crown and pavilion is very accurate; Seen from the table, the facets of the diamond pavilion are always bright and dark. Substitute diamonds often do not have these characteristics of diamonds, most of the edges are worn to varying degrees, most of the facets are irregularly handed over, and the crown pavilion alignment is not accurate enough.

Fourth, drop test.

This experiment is based on the oleophilicity of diamond (after rubbing the surface of diamond by hand, it will be found that diamond looks greasy). Specific practice: You can draw or write on the diamond surface with an oil-based pen, but when you do the same experiment on the surface of other gems or substitute diamonds, the oil stains will be intermittent floating drops. Similarly, there is a folk pencil marking method, which is to wet the diamond sample with water and then mark its surface with a pencil. If there is no pencil mark, it means that the sample to be tested is diamond, otherwise it is other gemstone species.

Of course, in order to accurately identify diamonds, we need a series of sophisticated identification instruments. Here, we just introduce several methods for consumers to quickly identify diamonds, hoping to help consumers buy diamond jewelry. In addition, when buying diamond jewelry, you must ask the seller for a diamond appraisal certificate (depending on which department issued the appraisal certificate). Only in this way can you guarantee the quality of the diamond jewelry you bought and provide evidence for possible quality disputes in the future.

K gold is divided into colored gold alloy and platinum alloy according to color. Au-Ag-Cu(-Zn) alloy is the most commonly used colored gold alloy in ornaments. Platinum alloys are mostly Au-Ag-Ni(Cu, Zn) and Au-Ag-Pd(-Zn, Cu) alloys. Gold mixed with 25% palladium or nickel and zinc. , will turn white, its main component is gold. This name is platinum, commonly known as K gold. In addition, an important point to identify the authenticity of K-gold jewelry is to identify the symbol of K-gold. For example, 18k jewelry will be marked with special marks on the inner ring. And 18KGP refers to gold-plated or gold-plated jewelry with a gold-plated layer of 18K gold; 23KGP refers to gold-plated or gold-plated jewelry with a plated or gold-plated layer of 23K gold. Be sure to read it clearly when buying.