Lao Fengxiang's diamond ring

Pay attention to buying such a product:
1. Be sure to see if there are old Fengxiang or its manufacturer's logo in the ring. There are also diamond logos, such as: D0.252CT, so it represents 25.2 diamonds. PT or PD logo.
2. The national inspection certificate and sales invoice are indispensable.
The diamond appraisal method after buying is as follows:
Methods 1. Because the diamond has the maximum hardness, it is necessary, and the waist edge of the diamond is generally carved on the polished jade board. If It can move Gang Jade Board, indicating that the detected gem is diamonds.
Methods 2. Another application of diamond thermalism in its identification is to speak for a batch of targets of the same size. Diamonds disappear on the surface of the surface due to its extremely high thermal conductivity. Other disappearances disappear. Very slow
Methods 3. Under long-wave ultraviolet radiation, the sun is also possible. Most diamonds emit blue-white fluorescences that are different. No, the gemstone that is tested is diamond.
Methods 4.
This oily test: Use a special pen or ballpoint pen with an oil -based ink to draw a line on the countertop of the diamond, leaving a piece of Uninterrupted straight line. Other imitation products are not intimate, leaving intermittent points at the line.
method 5.
The drop test: The water droplets on the diamond will be kept spherical for a long time, and the water droplets on the imitation products will spread in a relatively short period of time.

I really do n’t know, let ’s ask, look at the shopping invoice.