BORT or BOART. Imperfectly crystallised form of diamond unfit for gems and used for pointing rock drills, for bearings of fine machinery and other technical uses.
BOTRYOIDAL. A surface presenting a group of rounded projections.
Bort: Industrial grade diamonds Bow-Tie Effect: An effect caused by a shadowy area visible in some fancy shapes, caused by light leaking out the bottom of the Diamond.
Bort: Diamonds fit for industrial / mechanical purposes only.
Bourse: French, meaning an exchange or meeting place where merchants transact business. The word is often used for a diamond dealers club or organization.
Bort
Industrial grade diamonds generally used as drill points.
Bow Tie Effect ...
bort A lower grade of rough diamond unsuitable for polishing.
bottom halves Lower girdle facets.
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BORT
Bort is a term for industrial grade diamonds.
BOTANICAL GEMS ...
bort
A term for industrial grade diamonds, usually used in cutting applications
brilliance
The brightness that appears to emanate from within a diamond, due to the reflection of light that falls on the table back through the same facet ...
Bort
From Dutch boort, imperfectly crystallized diamond or diamond fragments used as an abrasive. Round, or shot, bort, found at Kimberley, was valuable for diamond drill points. Also spelt boart.
Botswana ...
Bort: An industrial grade diamond.
Botanical Gems: Are minerals that form from plant material. Amber is a botanical gem.
Bouton Pearl: See Blister Pearl ...
Bort ... see diamond ... bortz Comments: diamond unsuitable for gemstones, used in cutting and polishing.
Bournonite ... lead copper antimony sulfide
Crystallography: orthorhombic
Colors: dark gray to black
Luster: metallic
Hardness:2.5 - 3 ...
11: Bort Diamonds
Sec. II, Ch. 12: Carbonado Diamonds
Sec. II, Ch. 13: Value of Rough Diamonds
Sec. III, Ch. 1: Ruby
Sec. III, Ch. 2: Ruby Mines of Burma
Sec. III, Ch. 3: Ruby Mines of Burma Connection
Sec. III, Ch.
Spring 1943, (Fromesite bort-Holland Rose Cut), p. 73, 4pp.
Summer 1943, (Holohedral-Interference, Color), p. 95, 2pp.
Fall 1943, (Intergrowth-Knot lines), p. 105, 4pp.
Winter 1943, (Koffeyfontein Mine-Luminescence), p. 119, 6pp.
At present over 90% of the diamond abrasives ("bort") for industry, used in everything from the saws that cut through pavement, to dentists' drills, are synthetics produced in a laboratory.
Diamonds and other precious stones, rough or uncut, and not advanced in condition or value from their natural state by cleaving, splitting, cutting, or other process, whether in their natural form or broken, and bort; any of the foregoing not set, ...
This powder is prepared generally from bort, or faulty diamonds, and from the refuse in cleaving and cutting, which, being put into a mortar of hardened steel, is pounded until it is fine enough for use.
Eighty percent of all diamonds mined are industrial-grade stones called "bort," which are not of sufficient quality to use for jewelry. Of the 20% remaining, only one in about 10,000 diamonds is 1 carat or more in weight.
5] and diamond bort or carbonado are used instead), industrial applications today include use as "jewel" bearings in instruments and fine watches, and as a source of stimulated emission in ruby lasers.
This helps explain why 80% of mined diamonds (equal to about 100 million carats or 20,000 kg annually), unsuitable for use as gemstones and known as bort, are destined for industrial use.
and grinding tools, though, and the drilling industry uses lots of diamond for drill bits. The material used is worthless as jewelry, being black or included (that is, full of inclusions) or too fine grained. This grade of diamond is called bort.
 See also: Diamond, Rough, Cut, Stone, Crystal
  
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