Glossary Diamond Terms

  • AGS: American Gem Society Laboratory (AGSL)
  • AGS Ideal 0: Diamond rated by AGS as having ideal polish, symmetry, proportions and visual performance. This grade can only be assigned by the AGS Laboratory.
  • Rpt: Which independent gemological laboratory graded the diamond.
  • CGL: Central Gemological Laboratory – Japan / Antwerp
  • Clarity: The clarity grade of the diamond listed.
  • Color: The color grade of the diamond.
  • Consultation: Not a full report, specifies the characteristics of the diamond, but lacks a plotting diagram of the inclusions.
  • Crown: Crown angle measurement in degrees.
  • Cul: Culet size (bottom point of diamond).
  • Cut: Proportions rating as determined by Sarin Analysis.
  • Dpth: Total Depth measurement of the diamond in percent (%)
  • Dossier: Consultation style report issued by the GIA for diamonds weighing less than 1.00 carats, describes the characteristics of the diamond, but does not contain a plotting diagram representing the inclusions.
  • DQD: Abbreviation for AGS Diamond Quality Document (full report).
  • EGL: European Gemological Laboratory
  • EX: Excellent (highest rating available from GIA).
  • F – Girdle: refers to a faceted girdle.
  • FB: Faint blue fluorescence.
  • Flr: The fluorescence rating of the diamond.
  • FT: Faint fluorescence (usually blue)
  • GIA: Gemological Institute of America – Gem Trade Laboratory (GIA-GTL)
  • GIA-DD: GIA Diamond Dossier (passport size report). Girdle edge is laser inscribed with GIA Diamond Grading Report number.
  • GIA-XXX: Diamond graded by the GIA as having an Excellent Overall Cut Grade (highest rating available from GIA).
  • Girdle: Girdle thickness of diamond.
  • H&A: Hearts & Arrows Ideal Cut Diamond exhibiting an Excellent pattern.
  • HRD: Diamond Grading Laboratory for the Belgium High Diamond Council.
  • ID: Abbreviation for the word Ideal.
  • Ideal: This diamond has Zero Ideal Cut proportions.
  • IF: Internally Flawless clarity (no inclusions visible under 10x).
  • In House: The diamond is currently in-house and available for purchase.
  • Ins (Inscribed): the girdle edge of the diamond is inscribed, usually with the lab report number and/or brand name.
  • M – Girdle: The girdle thickness is Medium
  • MB: Medium Blue Fluorescence.
  • Memo: This diamond is out of our office, on loan to another dealer.
  • M-SK: Medium to Slightly Thick Girdle.
  • M-SK-F: Medium to Slightly Thick, Faceted Girdle.
  • M-TK: Medium to Thick Girdle.
  • M-TK-F: Medium to Thick, Faceted Girdle.
  • Measurements: Refers to outside diameter and depth measurements.
  • Nice Ice™ : Nice Ice is a Registered Trademark of Nice Ice, Inc. (that’s us)
  • N – Culet: None or too small to measure.
  • N – Fluorescence: None, Inert, Nil.
  • N – Girdle: Thin Girdle.
  • N-F: Thin, Faceted Girdle.
  • N-M: Thin to Medium Girdle.
  • N-M-F: Thin to Medium, Faceted Girdle.
  • N-SK: Thin to Slightly Thick Girdle.
  • N-SK-F: Thin to Slightly Thick, Faceted Girdle.
  • On Hold: The diamond is on hold for another buyer.
  • On Memo: the diamond has been loaned out to another dealer.
  • Origin: the country of origin for the diamond rough used to cut this diamond.
  • Pav: Pavilion depth measurement in percent.
  • PT = Pointed: Used by the AGS Lab to refer to a culet size formerly described as none.
  • Pol: the Polish grade of the diamond as assigned by a laboratory.
  • $ Price*: Selling price of the diamond in U.S. Currency. Refer to Sellers Terms.
  • Prop: the Proportions rating of the diamond as specified by the AGS Laboratory or as determined by Sarin Computerized Proportions Analysis.
  • Sarin: Computerized Proportions Analysis used by most laboratories to determine the proportions of the diamonds that they grade.
  • SB: Strong Blue Fluorescence.
  • Size: Carat Weight
  • SK: Slightly Thick Girdle.
  • SK-F: Slightly Thick, Faceted Girdle.
  • SK-TK-F: Slightly Thick to Thick, Faceted Girdle.
  • Source: The country of origin for the diamond rough that the diamond was cut from.
  • Sym: the Symmetry grade of the diamond as assigned by the laboratory.
  • Tbl: the Table Diameter measurement in percent.
  • Tolk-0: EGL Tolkowsky Cut diamond with zero ideal cut proportions.
  • VG: Very Good (very difficult to locate under 10x magnification)
  • VN: Very Thin – Girdle.
  • VS: Very Small – Culet
  • VSB: Very Strong Blue Fluorescence
  • Wire Transfer / Cash Discount (Price): represents the selling price of the diamond for cash purchase.

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