The scratch test is the simplest test that you can do at home. Jade is a very hard stone, much harder than normal steel. The scratch test involves scratching the jade with a needle or knife. You can use a steel kitchen knife and scratch the back of the jade piece. If the metal object leaves a scratch mark on the jade, then it is not jade. Jade has a hardness of between 6.0 and 7.0 on the Moh Scale. The hardness of steel is less than 5.0 on the Moh Scale.
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