Yes, there are two kinds of Liu Fu steel seals, the big one is "Hexagon Center Blessing+Thousand Gold" and the small one is "LF+ Thousand Gold". Steel seal is a very important identification mark. Lukfook Jewelry only recognizes steel seals when customers need to change money. If they don't know the steel seal, they will treat it as a nickname.

Extended data:

Diamond identification method:

First of all, look at the luster.

We all know that diamonds have a special luster, that is, diamond luster. Strong dispersion and high refractive index make diamonds dazzling. Under the light of 100w incandescent lamp, the polished diamond is more shiny than other similar gems.

Second, look at the adsorption force.

Diamonds can absorb sludge and dirt. If you have oily skin, you can touch your face and then touch the diamond. There is grease on your fingers, and you will feel that sticky when rubbing diamonds. Moreover, there will be finger fingerprints on the surface of the diamond, which is a feature that other gems do not have.

Third, look at single refraction.

Diamonds belong to the equiaxed crystal system and have the characteristics of single refraction. Looking through the diamond, the lines on the paper are all single lines, and the words are not repeated. Other gemstones are basically birefringent, and double images will appear when transmitted.

Fourth, the pen crossed the line.

After polishing, the surface of the diamond is very smooth. Even if it is very smooth, a slight stroke with a pen will leave a continuous ink line. If it is fake, it will only be a little bit.

Fifth, look at the hardness.

As mentioned above, diamond is the hardest gem in the world, and its hardness is 10. It is impossible for any other mineral or gem to carve it. If you can, then this diamond is fake.

References:

Baidu encyclopedia-Liu Fu jewellery

References:

Baidu encyclopedia-diamond