Relative hardness symbolised by h is determined by trying to scratch a surface of one mineral with an edge or corner of a second mineral. The hardest gemstones diamonds rubies and sapphires get a rating closer to 10 on the mohs scale while the softer gemstones amber chrysocolla and pearl are placed closer to 1 see the entire mohs index below.
The polish of gems with a mohs hardness of less than 7 can be damaged by common dust which contains tiny particles of quartz hardness 7.
Gemstone hardness rating. Gems that contain water such as opal can become dehydrated and crack. Gems over 6 are considered hard and thus suitable for jewelry. If a scratch or abrasion results the first mineral is the softer.
An opal for example which is quite soft for a ringstone rapidly becomes covered with fine scratches in daily use and the polish is quickly lost. Mohs hardness scale for gemstones the mohs hardness scale starts with talc at 1 being the softest mineral and ending with diamond at 10 being the hardest mineral. The 10 rating of a diamond is the highest and the 1 of talc is the lowest.
A ruby on the other hand will remain bright. Hardness in a gemstone will determine the degree to which it will show wear. Chrysoberyl is the next hardest gem mohs hardness of 8 5 followed by topaz and spinel.
A gem hardness tester also helps identity gems. For more information on caring for and cleaning different types of gems see our gemstone cleaning and care page. This makes them vulnerable to thumps and knocks that can be hazardous to a gemstone.
Even though ruby and sapphire corundum rate a 9 a diamond is many times harder. For example some rings like wedding rings are worn every day. Contact an expert at 800 452 7769 with questions about which gem hardness tester is right for you or shop now.
Gemstone hardness is a measure of how difficult or easy it is to scratch the surface of the gemstone. The durability of a gemstone is important. The intervals between numbers on the scale are not equal especially between 9 and 10.
The hardness rating of a gemstone is very important and has an effect when creating jewelry especially rings. Hardness is a mineral s resistance to abrasion or scratching. You can see the complete mohs chart including ratings for about 50 different gem varieties on our gem hardness information page.
Gems with a hardness rating of 1 2 are considered soft while those in the range of 3 5 are medium hard. Use kassoy s gem hardness tester to determine a gem or mineral s hardness or resistance to scratching. It is universally used around the world as a way of distinguishing minerals.
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