Gems must not touch grease. If you wipe them with olive oil, they will lose their original luster. Do not use bleach, chemicals or abrasive washing powder, detergent or toothpaste to clean gems, and do not use detergent or sulfuric acid to boil them.

Buy gem cleaning solution and wash it according to the instructions. Avoid falling, exposure, proximity to fire, hard objects and harmful chemicals. Jewelry that is often worn should be checked once a month to see if it is worn or loose, and then repaired.

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Gemstones have their own natural colors. Two problems should be paid attention to when observing the color of gems: don't observe the color of gems in transmitted light, and use it as the main color of gems. Also pay attention to the influence of light source and environment on color. For example, the color of ruby cannot be observed under dark brown glass or incandescent lamp.

Different crystal sizes will affect the color of gemstones. Some gemstone crystals are larger and thicker, but after processing, the color of gemstone waste becomes lighter and its value decreases. This often happens when processing raw materials such as aquamarine, amethyst and topaz. There are also some raw materials with strong color and low transparency, which have good color and transparency after processing, such as garnet.

The quality of gemstones should be high hardness, good transparency and purity, without impurities, cracks and defects. The ratio of the size and price of gemstones is not increased by mathematical series, but by geometric series, with a large span. Size also includes the thickness and size of obsolete sentences.

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