Ruby must be carefully cared for to keep its brightest luster. A bright ruby not only has a better reflection effect, but also looks bigger than some rubies stained with dander, oil, soap, cosmetics and kitchen oil stains in the casserole. Ruby is adhesive to oil, so it should be washed once a month to keep its luster. There are three simple ways to remove the stains on the surface of ruby: 1. Cleaning agent bath method-first soak the ruby in a small dish of warm water mixed with mild cleaning agent, then gently clean the ruby with a small eraser, then rinse the ruby with warm water on the filter screen, and finally dry it with a cloth. 2. Cold water soaking method-soak the ruby in the solution for about 30 minutes with half a cup of household Armenian water and the same amount of clean water, then gently clean the inlaid metal around the ruby ornaments with a small eraser, then gently wave it in the solution, and then wash the water with paper after taking it out. 3. Quick soaking method-buy a set of gem cleaning solution and wash rubies according to the instructions.