How-to guide

Understand Gross, Net, Stone, Pure weight & purity

Understand Gross, Stone, Net and Pure weight and how purity (karat fineness) drives metal value in jewelry software — with the exact formulas.

Any metal transaction

Steps

  1. 1Gross Weight = the whole item; Stone Weight = gemstones to subtract.
  2. 2Net Weight = Gross − Stone (the metal only).
  3. 3Purity is the decimal fineness (24K = 1.000, 22K = 0.9166, 18K = 0.750).
  4. 4Pure Weight = Net × Purity — this is what metal value is charged on.
Tip: Enter Gross Weight and pick a Stock Code with purity set — every other figure auto-calculates.

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