There should be no problem. I don't know how much you bought, but it's not the best. It's not very expensive, so there's little point in cheating. In addition, if Tmall guarantees that it should be true, you can look at the following professional knowledge, and there should be no doubt.

1, ordinary obsidian without rainbow eyes, is to look at the light under strong light, and the beads are still black without any other reflection. If the pendant is translucent, the light is a little dark green.

This obsidian has the largest output, but the lowest market value, so it is generally used for large-scale carving. There are few such fakes in the market, but there are also some unscrupulous merchants who make a pair with stained glass (the most common is this small pendant, which retails for several to ten dollars) and a pair with inferior black stone (usually a large sculpture, characterized by many gray spots/spots/stripes under the light). It is difficult for non-experts to distinguish these two kinds of fakes, and the best way is to avoid contact.

2, rainbow eye (light) obsidian, that is, under strong light, you can see green/purple/yellow reflection.

This obsidian is of good quality. Compared with obsidian beads, such as bracelets or small pieces such as obsidian gourds, rainbow eyes are concentric circles; Compared with obsidian carvings, rainbow light is not round, but a piece, such as a pendant; If the rainbow eyes are double rainbow eyes (that is, one on each side of the beads), they are round and big, and it is best to shine. If there is rainbow light, the reflection must flash. If it doesn't flash, it can only be ordinary quality rainbow light. In addition, many sellers in the market fry all green/all purple eyes, and the price is several times that of ordinary double rainbow eyes. In fact, the all-green/all-purple rainbow eye does not prove that its quality is better than the general double rainbow eye. If you have to give a reason, it may just be that all green/all purple eyes look better or are difficult to match.

Degaussing obsidian. After wearing obsidian for a long time, it is necessary to do a comprehensive maintenance of obsidian, that is, degaussing. It is to add special salt to water, which is what we call imperial salt, and then soak the whole obsidian in water for a whole day, and then wash it with clear water.