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The ability of a gemstone to resist pressing, gol urish yoki silliqlash uning qattiqligi deb ataladi. The hardness of a gemstone is related to its chemical composition, chemical bond and crystal structure.

Hardness is one of the three essential elements of gemstones, and it is also a problem that must be paid attention to in gemstone polishing. There are generally two test methods for gem hardness: relative hardness (commonly used Mohs hardness) and absolute hardness (also called compression hardness). The absolute hardness of gems is the microhardness of mineral crystals measured by various Gu microhardness meters under standard conditions. Due to the complexity of equipment and tests, they are mostly used in scientific axe research, but rarely used in gemology.

The property of a gemstone that is not easily broken under the action of external force is called toughness, also called toughness. Toughness is related to the structure and structure of minerals. Masalan, the toughness of black diamond (black diamond) crystals of microcrystalline combination is much greater than that of colorless single crystal diamond crystals. Diamond is the hardest substance in gems. It is particularly hard, but not tough and easy to break. Shu sababli, you should try to avoid impact when wearing or processing. Boshqa bir misol uchun, nephrite has a lower hardness than diamond, but it has greater toughness and less brittleness, and it is difficult to break under extreme static pressure; zircon has a higher hardness, but it is often caused by harder wrapping paper. Damage due to collision, this phenomenon is often called “paper erosion.”

Hardness and toughness are two completely different concepts. Hardness refers to the degree of scratch and wear, while toughness refers to the degree of toughness against cracking.

The relative density of a gemstone is defined as the ratio between the mass of the gemstone in the air and the mass of an equal volume of water at 4°C and standard atmospheric pressure. The mass of gems in the air can be directly called, according to Archimedes’ law, the mass of an equal volume of water is equal to the mass of gems in the air minus the mass of gems in water.

Relative density has no units. Density or relative density is one of the important physical parameters of gems.

According to the different optical properties, gem minerals can be divided into two types: homogeneous and heterogeneous. In all directions, gem minerals with the same optical properties are called homogeneous bodies, kabi olmos kabi, garovlar, va hokazo.; gem minerals whose optical properties change with different directions are called heterogeneous bodies, such as rubies and olivines.

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