1, beryllium magnesite.

A hexagonal crystal system that looks like spinel, but its value is many times higher than that of spinel. Beryllium magnesite contains different substances and presents different rich colors, and its value is about 20 thousand dollars per gram. However, this kind of gem is relatively rare. The largest beryllium magnesite in the world is only 10 carat. At present, gem-grade beryllium magnesium ore has not been found in China.

2. Tritium.

A radioactive substance consisting of protons and two neutrons. The market price is $30,000 per gram, which is mainly used in industry, hydrology and other fields. Tritium labeled compounds are very important research tools and are also very common in life. Many large buildings can see the green "export" font, and some luminous watches also have this substance, but the content is very small.

3. Carbon carved diamonds.

As the hardest natural material, the value of carved diamonds should not be underestimated. First-class pure diamonds cost about $65,000 per gram. Diamonds cut by professional organizations are made into various exquisite jewelry, which will be more expensive under the influence of brands and other factors. These diamond jewelry has become one of the favorite jewelry of many women.

4. Al-B-Zn-Ca stone.

Rutile boehmite, also known as rutile boehmite, is relatively rare, and it is said that the cost is as high as $300,000 per gram. This rare material is mainly produced in a gem mine in Myanmar, and it is the largest Al-B-Z-Ca mine in the world, weighing1.7g. ..