Durability is the capacity to withstand abuse. The relative resistance to fracture is another. Although diamond is extraordinarily hard and is not fragile, it has a plane of weakness in its structure, a cleavage, along which it can be split. All substances, even diamond, can break or shatter. It is the result of its great dispersion - the refraction and separation of white light into rainbow colors.
Diamonds are cold to the touch.
In fact, they actually extract heat away from the area they touch. Diamond slices rapidly through ice because it transmits heat from the fingers holding it. Normally, diamond is a poor conductor of electricity. We are precious to God. He delights in us.