Oiliness test: use a special pen or ballpoint pen dipped in oily ink to draw a line on the diamond table, which will leave an uninterrupted straight line. However, other imitations are not lipophilic, leaving intermittent dotted lines at the scribe line.
Water drop test: the water drops on the diamond will remain spherical for a long time, while the water drops on the imitation will disperse in a short time.
Breathing test: breathe into the diamond, if the water vapor on the diamond disappears, it will become a real diamond immediately; If the water vapor stays on the diamond for a few seconds and then disappears, it is a fake diamond.
Sensory test: At room temperature, diamonds and their imitations are much cooler when you touch them with your tongue.
A Simple Method to Identify Diamonds With the increasing demand for jewellery diamonds, the market for counterfeit diamonds such as synthetic diamonds is constantly expanding, and even some jewellery operators can't tell the difference. Here are some simple ways to identify the authenticity of diamonds.
1, the single refraction of diamond is determined by the essential characteristics of diamond. While other natural gemstones or artificial gem are mostly birefringent. When the fake diamond is observed with a magnifying glass of 10 times, it is easy to see that the edges and corners overlap, and two bottom lights are exposed at the same time from the slightly inclined front. If the difference in birefringence is small, such as zircon, you can also see the image of overlapping background light.
2, the adsorption of diamonds diamonds have a certain affinity for oil and dirt, that is, oil is easily adsorbed by diamonds. So touching the diamond with your fingers will feel sticky, and your fingers seem to feel sticky. This is not found in any gem. This method needs training to master the nuances.
3. The surface of the diamond with straight features is polished smoothly. Dip the pen in ink and cross the diamond. If it is a real diamond, the surface will leave a smooth and continuous line, which is characterized by a straight line. Forgery will leave dots and lines. Observation in this way should be made with the help of a magnifying glass.
4. Unique diamond luster, roughly under the incandescent light of 100 degree. By comparing with the fake, it is easy to see which diamond has diamond luster. This method should not be carried out in too dark or too strong light.