Diamond is the hardest natural mineral on earth. Only because the hardness on the diamond's surface is variable, they can be grinded by other diamonds. This is because of the anisotropism, which can be verified in the different directions of the crystal. Diamonds consist of carbon which makes them flammable, unlike metals or other valuable materials. Diamonds can be identified by their thermal conductivity and their high reflection of light.
To determine the exact weight of a diamond, there are various methods - for example, they can be weighted with specially designed diamond scales, but also a normal digital scale can do the job. Many digital scales have a measuring function for carats, so that the user does not have to convert the data. Modern digital scales also have a Tara-function, which means that the container, in that the object is stored, will not be weightet. The weight of the container will be subtracted from the final amount of weight.