How do gross weight and net gold weight differ in a stone-set necklace?
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Direct answer
Gross weight includes the whole item; net gold weight should exclude stones and other components that are not part of the stated gold alloy.
Ask the seller to itemise those deductions and explain whether the stones were weighed separately or estimated. The rate and purity must then be applied to the appropriate metal weight. Keep the calculation with the invoice and any assay record. A heavy necklace is not necessarily a larger gold purchase if a substantial part of its weight comes from stones, filling or other materials.
Sources used
Jewelry Guides
US Federal Trade Commission
Material and value disclosure principles; US regulatory provisions are not Pakistani sales law.Source checked:
View sourceMethods for Determining Gold Content of Jewelry Metals
Gemological Institute of America
Primary comparison of testing methods and limitations. Historical technical study, not certification of a buyer's individual piece.Source checked:
View source