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fashion necklace wholesale Basic conditions of natural gemstones (2)

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If the gem has only a beautiful appearance, the flowers bloom, and the years pass by, it cannot be called a gem. As a gemstone, it must go through the erosion of time and remain young forever, to je, gemstones must be durable.

The so-called durability refers to the hard texture and durability. Most gemstones can resist friction and chemical erosion, and will always maintain their beauty. The durability of gems largely depends on the hardness of the gems. The hardness of gems is generally greater than 7 on the Mohs scale. This kind of hardness makes the gemstone outstanding over the years. The imitation glass of gemstones quickly lost its brilliance because of its low hardness. That’s because the main component of dust and gravel in the air is quartz, which has a hardness of 7, so gems with a hardness of less than 7 stay in the air for a long time. They are often impacted and worn by the dust in the air, and the surface will become uneven. There are some traces of scraping marks. Navíc, in the process of polishing gems, the hardness of the abrasives used should be significantly higher than the hardness of the minerals, otherwise the gem surface will appear uneven.

Obvykle, the Mohs hardness of gems is required to be greater than 5.5. If other conditions are particularly good, this condition can be reduced. Například, pearls have a hardness of only 3. All dilute acids can corrode it, but its charming pearl halo makes it the queen of gems.

 

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