The main characteristics of diamond are: excellent thermal conductivity, extremely high hardness, typical diamond luster, beautiful and soft dispersion, high refractive index, isotropic body, intersection of sharp edges and the corresponding relationship between standard cutting diameter and weight. Therefore, the identification of diamonds generally starts from these angles.

First, introduce several simple identification methods in daily life without the help of professional tools:

A, "stroke recognition method"

Because diamonds are lipophilic, you can draw on the diamond table with an oil pen (or a commonly used signature pen). Don't worry, real diamonds don't leave scratches. If the lines drawn are coherent, it means that they are real diamonds. If the lines are not obvious or discontinuous, there is probably something wrong. Considering the quality of ballpoint pen, you can draw more times. ).

Second, the "breath recognition method"

Natural diamonds have good heat transfer ability and fast heat dissipation. When the diamond to be tested is close to the mouth, breathe gently to cover the diamond to be tested with a layer of light fog. At this time, immediately pay attention to the evaporation of the diamond fog. If it is a natural diamond, the fog will dissipate immediately. Otherwise, the fog will stay on the fake diamond for a while and then dissipate.

Iii. [Water Drop Identification Method]

Wipe the top surface of the diamond and dip a toothpick in a drop of water. The water droplets on a real diamond will be medium-sized round water droplets. The water droplets on the fake diamonds will soon disperse.

Four, [pencil identification method]

After the diamond is wet with water, scratch it with a pencil, and there will be no pencil marks on the surface of the real diamond. Transparent fake diamonds such as crystal, glass and tourmaline will leave traces.

Verb (abbreviation of verb) [representation recognition method]

Diamond is so hard that it is difficult to leave a notch on it with a blade or something. In addition, a slight scratch on the glass with diamonds will leave more obvious white marks. Fake diamonds do not have this phenomenon.

Six, [optical identification method]

Real diamonds have the characteristics of single refraction, radiant and dazzling brightness, but you can't see fingerprints when you wear them on your hands. Fake diamonds, such as crystals, have poor dispersion and low refractive index, and fingerprints can be seen through the crystals.

Clean the diamond and put it on a piece of lined paper with the table top (the biggest side of the diamond) facing down. If the diamond is cut in a standard way, the lines on the paper are invisible through the diamond, while most imitations allow enough light to pass through, at least some lines can be seen.

VII. 【 Touch Recognition Method 】

Because diamonds have affinity for oil, and people's finger skin will secrete some trace oil, gently touching the crystal face of diamonds with fingers will have a sticky feeling. Use a magnifying glass, but this method requires some experience. Try it several times with your hands and slowly cultivate your feelings. For the finished diamond that has been inlaid, you can touch it by hand and check it with a magnifying glass, and you will find that the diamond is stained with more oil than the diamond substitute or other gems.

Eight, "contact identification method"

Diamond is crystalline carbon with excellent thermal conductivity. If you touch the diamond with your tongue, cheeks and the back of your hand, the human body is at a constant temperature. If the diamond heats up, it is an imitation. Real diamonds cool if they are left for a long time.

Here are several identification methods that rely on professional tools or complex points:

Nine, [cut mirror identification method]

Looking at diamonds through the cutting mirror, we will find that the interior of natural diamonds is dazzling and has complicated sections. On the other hand, other fakes are bland, with few sections or even completely invisible.

X.[ Identification method of thermal conductivity meter]

The accurate and reliable way to distinguish between true and false diamonds is to measure the thermal conductivity of various diamond substitutes or counterfeit products with a diamond tester (that is, a thermal conductivity meter), and the problem of distinguishing between true and false diamonds will be solved. According to the maximum thermal conductivity of diamond, it is detected by diamond thermal conductivity meter. If it is natural, you can make the thermal conductivity meter buzz and light up a red light. This is the most accurate and simple way to identify diamonds.

XI。 [Hardness tester identification method]

Measuring hardness with "standard hardness tester" is also a simple and reliable method to identify diamonds. The "Standard Hardness Tester" is a rectangular box with the size of only 65×55×23 mm After the cover is opened, there are four standard hardness tablets with a mirror-like surface, and their Mohs hardness is 6, 7, 8 and 9 respectively. As long as the standard part with hardness of 9 is scratched with a diamond, if it can scratch the scar, it is a real diamond, and if it can't, it proves that its hardness is less than 9 or equal to 9, it is a fake diamond.

Twelve. [Certificate query and authentication method]

Jewelry merchants generally provide jewelry appraisal certificates when purchasing finished diamonds that have been inlaid. This is the most accurate and detailed description of the quality of diamonds. The providers of appraisal certificates have professional and authoritative positions in the industry, and the reliability of certificates can only be inquired through relevant websites. As long as the serial number of the jewelry appraisal certificate can be found on the relevant website, there is basically no need to doubt the authenticity of the diamond! The fire color of diamond is soft orange-blue tone, while the fire color of synthetic cubic zirconia can see extremely strong red-purple fire color, which is not available in diamond! Moreover, diamonds are lipophilic. If you draw on them with an oily pen, you will leave continuous lines, but synthetic cubic zirconia will not! I'm a graduate student studying gem identification. If I still don't know, go to Baidu Post Bar "Gem" and ask me!