There will also be steel seals in fake diamond rings. A diamond ring is divided into two parts: a diamond and a ring holder. Steel seal is printed on the ring holder, including material, diamond weight, merchant and other information. Regular jewelers will mark the diamond ring to prove its authenticity and quality. Diamonds will show blue fluorescence under ultraviolet or strong light. If you see bright blue light, it is a real diamond, otherwise it is a fake diamond. Real diamonds dissipate heat quickly and are not prone to fogging. If you breathe into a diamond, the fog will dissipate quickly. If the fog stays for a long time, it is a fake diamond. If you breathe into the diamond repeatedly, the fog on the surface of the fake diamond will become more and more obvious. Real diamonds are always clear, and the hardness of diamonds is high, so it is difficult to leave scratches on the surface.