It is a strong, rigid three-dimensional structure that results in an infinite network of atoms. This accounts for diamond's hardness, extraordinary strength and durability and gives diamond a higher density than graphite (3.514 grams per cubic centimeter).

Most Dense Element Under ordinary conditions of temperature and pressure, osmium is the element with the highest density. Its density is 22.59 g/cm^{3}. At high pressure, iridium becomes the densest element, with a density of 22.75 g/cm^{3}.

For example, consider diamond and graphite. Both are polymorphous crystalline forms of the element carbon (C). Since diamond's structure packs its carbon atoms tightly, it has a density of 3.5.

Diamond is a crystalline form of carbon which has a density of has a density of 3.51 gm/cm^{3} compared to 2.26 gm/cm^{3} in the graphite form. Imperfectly formed crystalline forms of diamond are called bort and black diamond.

It also has a high density, ranging from 3150 to 3530 kilograms per cubic metre (over three times the density of water) in natural diamonds and 3520 kg/m^{3} in pure diamond.

Diamond has the highest number density (i.e., the number of atoms per unit volume) of all known substances and a remarkably high valence electron density (rws = 0.697 Å).

At the modest temperatures and pressures of Earth's surface, the densest known material is the metallic element osmium, which packs 22 grams into 1 cubic centimetre, or more than 100 grams into a teaspoonful. Even osmium is full of fluff, however, in the form of electron clouds that separate the dense atomic nuclei.

It is a strong, rigid three-dimensional structure that results in an infinite network of atoms. This accounts for diamond's hardness, extraordinary strength and durability and gives diamond a higher density than graphite (3.514 grams per cubic centimeter).

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