18k refers to gold with a gold content of 750%, also called AU750. The inlaid jewelry is generally 18K, which is very suitable for inlay, because its hardness is much higher than that of gold. The diamonds on it are generally real, but the grades of diamonds are different and the prices vary greatly. Generally, diamonds are marked with tens of carats, 1 carat = 100 minutes, 1 gram =5 carats. The average diamond ring of 1 carat is around 20000. As you said, 1.2 grams, that is, 6 carats, is rare, and the minimum is more than 500,000. And what you said is only for 1700, so I'm sure it's not true. It's probably zircon This kind of artificial stone is very cheap. There is also buying a diamond ring. In general, diamonds have quality inspection certificates.