NIDG
NATIONAL INSTITUTE OF DIAMOND & GEMS
"AN ISO 9001: 2008 CERTIFIED"
(GOVT. Registered)



Diamond Essentials

  •    The value of diamond & the 4c's
  • Carat Weight

    a) Diamond weight estimation formula
    b) Diamond weight estimation of round brilliant with normal proportion

    Clarity

    a) Clarity characteristics
    b) Plotting
    c) Clarity grading

    Color

    a) Diamond types
    b) Normal color range
    c) Fancy color
    d) Artificially colored diamond

    Cut

    a) Proportions
    b) Measurement
    1) Round brilliant cut
    2) Fancy shapes
    c) Estimating propartion
    1) The crown angle
    2) The table
    3) The crown height
    4) The pavillion depth
    5) The girdle thickness
    6) The culet terminology
    d) The proportion grades