Brilliant Cut:
Cutting style wit triangular or kite-shaped facets that radiate from the center towards the girdle.
Standard Round Brilliant:
A round brilliant-cut stone with 57 0r 58 facets, often called a full cut.
Single Cut:
A round stone with 17 or 18 facets.
Fancy Cut:
Any gemstone shape other than round.
Step Cut:
A cutting style that features long, narrow facets in rows (usually three) parallel to the girdle on both the crown and pavilion.
A small, four-sided step cut that’s rectangular, square or tapered.
Mixed Cut:
Cut that combines brilliant-cut and step-cut styles. Branded cut: Cutting style that is developed, named and promoted by a specific manufacturer.
Gem Quality:
Rough Gem material that requires normal processing to produce a polished gem suitable for use in gem jewelry.
Near-Gem Quality:
Rough Gem material that requires substantially more processing than gem quality rough to produce a polished gem suitable for use in jewelry.
Industrial Quality:
Rough gem materials suitable for use in tools, drills, abrasives an dother Industrial applications.
The Mohs (pronounced moze) rates the hardness of the gems and minerals. The scale originated in 1822 when Fredrich Mohs chose 10 minerals and assigned numbers to them, based on the relative ease or difficulty with which one could be scratched by another.
  • Diamond 10
  • Corundum 9
  • Topaz 8
  • Quartz 7
  • Orthoclase feldspar 6
  • Apatite 5
  • Fluorite 4
  • Calcite 3
  • Gypsium 2
  • Talc 1