Diamond 4Cs: Carat Weight

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Carat, spelled with a C, is the standard unit of weight for gemstones. Did you know that two diamond shapes of the same carat weight may not look the same size when viewed from the top, or that diamonds of the same shape and weight can look different sizes? This eLearning course teaches core gemological education while emphasizing information buyers and sellers find most relevant at point of sale.



Diamond 4Cs: Carat Weight | Course 101

This eLearning course provides important information involving industry terms for carat weight, the impact of shape on weight, how to determine the physical spread of a diamond, in addition to its weight and the disproportionate impact carat weight has on value as it increases.

Learn with IGI

IGI grades more diamonds, gemstones, and jewelry in more locations around the world than any other gemological organization. IGI is the world’s first institute to hold ISO Accreditation in both natural and lab grown diamond grading and the only worldwide institute protecting consumers by grading finished diamond jewelry, as well as loose gemstones.

Diamond 4Cs: Carat Weight | Course 101



Companion Courses: Diamond Program*

  • 4Cs: Color
  • 4Cs: Clarity
  • 4Cs: Cut
  • The Natural Diamond Story
  • Lab Grown Diamonds

*Pass all six Diamond Program courses to receive an IGI Certificate of Completion

Diamond 4Cs: Carat Weight | Course 101

  1. Carat weight vocabulary
  2. Diamond shapes and size appearance
  3. Using physical spread
  4. Carat weight and diamond value
  5. Total Carat Weight