(1) Opal is welcomed by many people because of its flame-like appearance, but it is soft, with poor toughness and easy to be broken or damaged. Therefore, it must be used and maintained carefully. The common opal jewelry is brooch, necklace and earrings. In use, these ornaments should try to avoid rubbing or colliding with other ornaments. Opal is very beautiful, and when viewed in bright sunlight, it can show its shining brilliance. However, long-term exposure of opal to strong sunlight should be avoided, because high temperature and temperature changes are easy to crack opal, leading to fine cracks or fractures. Some opals contain many micropores, which easily lead to uneven temperature when heated, so they cannot be cleaned with hot solution. When the opal cracks, it can be coated with nail polish with similar color or colorless and transparent glycerin to change the appearance of the opal. (2) Opal gemstones are afraid of heat. When heated, the water in opal may be lost, which reduces the color change of opal and makes it brittle and easy to break. Opal is afraid of collision. It is generally believed that Opal is a female gem, mainly because it is convenient for men to wear. Interlayer opal cannot be put into hot water and organic solvents, otherwise the glue in the interlayer will dissolve and fall off, damaging jewelry. (3) The maintenance of opal jewelry should pay attention to the following four points: ① Opal is loose in texture and low in hardness, and should not collide with other hard materials. (2) Opal should not be exposed to the hot sun for a long time, nor should it be close to high temperature, so as not to make it lose its luster or burst. If you are wearing a ring made of opal, when you wash your hands with soap, you must take it off, otherwise it will damage the gem. ③ Some opals contain many micropores, which easily lead to uneven temperature when heated. Therefore, they should not be washed in high temperature solution or warm water containing fat. Overheated and fatty warm water will make most opals white or brown, and the discoloration may disappear. Once it is discolored or faded, it cannot be recovered. ④ Some black opal is soaked in grape sweat or orange sweat containing low-grade porous opal, and then dried, carbonized and blackened. This kind of opal jewelry should avoid blisters to avoid fading.