bort

Cutting-grade carbon

Bort is low-grade diamond unsuitable for gems but valued for industrial applications—cutting, drilling, grinding, and polishing.

The material is too flawed, discolored, or irregularly shaped for jewelry but retains diamond's hardness.

Also spelled boart.

industrial

diamond

Crystallized carbon gemstone

abrasiveRough enough to erode
cuttingDividing via sharp edge
drillingHole-making by rotation

grinding · polishing · grit · hardness · carbon · crystal · lapidary · synthetic · corundum · carborundum

gemology

diamond

Crystallized carbon gemstone

inclusionsThings placed within
flawedHaving faults or imperfections
roughUneven in surface

uncut · impure · off-color · fractured · irregular · carat · grade · sorting · clarity · reject

Opposites

diamond quality

Intensely bright or gifted

gemstone · paragon · precious stone · crown jewel · Hope Diamond

Familiarity: Top 1,000,000
Profile: Used worldwide · Timeless · Concrete · Rated G