https://www.google.ru/#newwindow=1&tbs=li:1&q=rough industri...

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Note added at 23 мин (2016-03-29 16:14:11 GMT)
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Industrial diamond, any diamond that is designated for industrial use, principally as a cutting tool or abrasive. In general, industrial diamonds are too badly flawed, irregularly shaped, poorly coloured, or small to be of value as gems, but they are of vital importance in the modern metalworking and mining industries. Their utility stems from the fact that diamond is the hardest natural substance known.

Industrial diamonds can be mined from natural deposits, or they can be produced synthetically. Among the naturally occurring diamonds, three varieties exist: ballas, bort, and carbonado.

Ballas, or shot bort, is composed of concentrically arranged, spherical masses of ... (100 of 416 words)
http://global.britannica.com/art/industrial-diamond

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Note added at 27 мин (2016-03-29 16:18:22 GMT)
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На сайте АЛРОСА употребляется также technical grade diamonds:

Industrial diamonds

ALROSA is the largest supplier of natural technical grade diamonds to Russian and foreign markets.

Technical grade diamonds include:

All diamonds of sieve classes from –3+2. –2+1. –1+0.5 and –0.5
Drilling diamonds of sieve classes from -9+7 to -4+3
Boart diamonds of all size and weight groups

Natural technical grade diamonds are used to manufacture tools for stone and metalworking, medicine, and to manufacture polished diamonds (including for the watch industry) and souvenirs.

ALROSA also manufactures natural diamond powders from 1,000 mkm to 40/0 mkm.
http://sales.alrosa.info/industrial-diamonds/auctions/

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Note added at 32 мин (2016-03-29 16:23:59 GMT)
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Industrial Diamonds

We supply rough industrial diamonds selected for the various diamond tooling requirements of our customers.
http://indab.com/products/industrial-diamonds/

При этом проводится различие между 'rough jewelry diamonds' и 'rough industrial diamonds'.

Напр.,

Classification of rough jewelry diamonds and industrial diamonds
http://www.ajediam.com/rough_uncut_diamond_prices.html