Deciphering the Jeweller’s Diamond Speak

Some diamond wholesalers seem to have a language all of their own. But you can still live in their world. After all, if you’re buying a loose diamond it’s important to make a good investment. So here’sa hit list of dealer lingo you might find yourself speaking in the wholesale diamond showroom.

  • Blemish:  is a flaw on the outside of the diamond.  It might be a scratch, nick or chip.
  • Blue Flash:  also called Blue White, this means the stone glows blue under ultraviolet light.
  • Brilliance:  how much white light an individual diamond reflects.
  • Brilliant:  different to brilliance, this term means a round stone cut with 58 facets.
  • Carat:  in simple terms, a unit of weight.  One carat is equal to 200 milligrams.
  • Carbon:  is the base element from which diamonds are formed.  Tiny carbon spots exist within most stones.
  • Cloud:  when a group of small internal flaws is clustered together within a gem.
  • Crown:  basically the top section of the diamond, or all of the stone above the girdle.
  • Cutlet:  usually cut very small, this is the bottom-most facet of a fine cut stone.
  • Eye clean:  when no internal or external flaws can be seen with the naked eye.
  • Facet:  a flat, polished area ground into the surface of a stone during cutting.
  • Fire:  also called dispersion, how much coloured light an individual diamond reflects.
  • Florescence:  how a diamond behaves and if it glows when exposed to ultraviolet light.
  • Full cut:  any stone cut with a minimum of 58 facets.
  • Gemmologist:  someone qualified and accredited to assess precious and semi-precious stones.
  • GIA:  Gemological Institute of America.  A global organisation upholding diamond grading standards.
  • Girdle:  separating the crown and pavilion is this narrow unpolished band encircling the stone.
  • Head:  another name for the claws or prongs that hold a diamond in its setting.
  • Inclusion:  is a flaw on the inside of the diamond.  It might be a carbon spot or fracture.
  • Laser drilled:  a treatment used to remove carbon spots from diamonds.
  • Loupe:  a small magnifying glass used to view stones.
  • Off make:  a diamond that has been cut to inferior proportions.
  • Pavillion:  basically the bottom section of the diamond, or all of the stone above the girdle.
  • Point:  a measurement of one-hundredth of a carat.  Therefore one carat = 100 points.
  • Single cut:  any diamond cut with 16 or 17 facets.
  • Sparkle:  a measure of light return quality that combines brilliance and fire

A little bit of diamond education goes a long way when it comes to understanding gemstone terminology.

Now you know know some of the terminology, customise your commitment with a unique diamond engagement ring here.