Diamond

thumb|upright=1.25|Main diamond producing countries

thumb|False-color scanning electron microscope image of kimberlite from South Africa. [[Olivine crystals (green) are in a fine-grained matrix made up of clay minerals and carbonates (presented in blue, purple and buff colors).]]

Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon, with minor crystalline precipitates filling pores and occasional reduced metal inclusions. Titanium nitride (TiN, osbornite) has been found in carbonado. It is found primarily in alluvial deposits where it is most prominent in mid-elevation equatorial regions such as Central African Republic and in Brazil, where the vast majority of carbonado diamondites have been found. It

Bort, boart, or boort is an umbrella term used in the diamond industry to refer to shards of non-gem-grade/quality diamonds. In the manufacturing and heavy industries, "bort" is used to describe dark, imperfectly formed or crystallized diamonds of varying levels of opacity. The word is ultimately Dutch and is related to the English term for drilling, to bore. The lowest grade, "crushing bort", is crushed by steel mortars and used to make industrial-grade abrasive grits. Small bort crystals are used in drill bits. The Democratic Republic of the Congo provides 75% of the world supply of crushing

shaping a mineral into a gemstone to be set in a piece of jewelry

point defect in diamonds

diamond necklace

nuclear battery concept

relating to the appearance of internal and surface defects in diamond

lab-grown diamonds that are promoted as being produced from carbon extracted from human or pet animal hair or cremated remains

diamond classification system

thumb|upright=1.2|Natural nanodiamond aggregates from the Popigai impact structure, Siberia, Russia. thumb|upright=1.2|Internal structure of the Popigai nanodiamonds. thumb|upright=1.2|Internal structure of synthetic nanodiamonds. thumb|right|upright|Electron micrograph of detonation nanodiamonds

diamond rock which has not been cut or processed

saw blade with diamond grit bonded to the cutting surface

Breyite is a high pressure calcium silicate mineral (CaSiO3) found in diamond inclusions. It is the second most abundant inclusion after ferropericlase, for diamonds with a deep Earth origin. Its occurrence can also indicate the host diamond's super-deep origin. This mineral is named after German mineralogist, petrologist and geochemist Gerhard P. Brey.thumb|CaSiO3 phase diagram showing Breyite is stable around 3-9 GPa|293x293px