Diamond rich market and formation deposit has two big kinds: One for magma of cliff of 欖 of Gan of horny gravel mica is direct and ejective upper former unripe bed, submit canister form as a result of most cliff body ejective, accordingly, exploitation diamond 係 collects mining of straight hole type; Another for secondary alluviation bed, i.e. diamond and decency of course of its mother cliff, after eroding, be taken to come by river water riverbed or seaside, because diamond comparing is great (3.52) , constant someplace is particularly rich collect. Exploitation this model diamond most resembles pan alluvial gold kind, 係 uses pan means to obtain, river of south Africa tangerine (Orange River) the diamond bed of open waters belongs to this kind of type namely.