How this calculation works
Separate the physical nonmetal deduction from fineness and the offered assay adjustment. Price only the accepted fine-gold basis, then apply percentage and fixed charges in the stated order.
Credit = (gross − nonmetal) × fine fraction × (1 − relative assay haircut) × pure-gold quote × (1 − dealer deduction) − fixed feeA worked example
A 20 g item with 2 g nonmetal and 91.6% entered fineness contains 16.488 g fine gold before haircut. A 1% relative haircut leaves 16.32312 g; the illustrated price and fees give credit of 95,479.9456.
Good to know
Entered offer arithmetic, not an assay, live quote, tax calculation or guaranteed redemption. Price basis is one gram of pure fine gold; no hidden conversion from a lower-karat quote.
Reference: BIS: hallmarking and fineness background (opens in a new tab) ↗
Deduct nonmetal before applying fineness
Stones and other nonmetal do not become fine gold when a purity percentage is applied. Subtract their mass once, then apply the entered fineness to the remaining metal.
The calculation does not test the item, confirm a hallmark or measure hidden nonmetal. Those are evidence inputs, not conclusions produced by entering a number.
A relative haircut is not a purity-point deduction
One percent of fine-gold mass is different from subtracting one percentage point from 91.6% fineness. This page uses the former convention and labels it explicitly.
If an actual dealer quote follows another convention, convert or compare it separately rather than silently treating the two deductions as interchangeable.
Read the price and fee bases
The price is per gram of pure fine gold. A quoted price for a particular alloy cannot be pasted into that field without matching its basis.
Dealer percentage is charged on accepted metal value, and the fixed fee follows once. Negative credit is retained to expose a scenario where entered charges exceed metal credit; it is not forced to zero.
Use the result with the next measurement
The pure live seed cost comparison calculator also distinguishes purchased bulk material from a defined useful fraction. Gold fineness, assay evidence and dealer terms remain a completely separate measurement and pricing context.
Entered offer arithmetic, not an assay, live quote, tax calculation or guaranteed redemption. Price basis is one gram of pure fine gold; no hidden conversion from a lower-karat quote.
A few questions, answered
Does this verify purity?
No, fineness and assay adjustments are entered.
Is the price fetched live?
No, use an entered quote with the stated pure-gold basis.
Is the haircut a percentage-point deduction?
No, it is a relative reduction of fine-gold mass.