Trading
Rapaport discount calculator
Net price per carat and stone total from the Rap list price and your back discount, settled in your currency.
The numbers diamond traders and jewellery manufacturers work out every day, from Rap discounts to Tunch loss. Free to use, no sign-up. Inside eheera these run automatically on every stone, memo and job bag.
Net price per carat and stone total from the Rap list price and your back discount, settled in your currency.
Estimate the carat weight of a mounted or loose stone from its measurements, using the standard shape factors.
Fine (pure) gold in a piece or lot from its gross weight and karat, and its value at today's 24K rate.
Quote a finished piece: metal at karat purity, making charge per gram, diamonds and tax.
Check what a karigar or casting house returned against what you issued, in fine gold.
Polished yield, cost per polished carat and margin for a rough lot after cutting.
Carats, grams, tola, troy ounces, Hong Kong tael, Thai baht and more, in one step.
Results are estimates for quick checks. Carat estimates use standard shape factors and can vary with girdle thickness and cut. Exchange rates are fixed reference rates; enter your own gold rate for the day.
The formulas behind each calculator, so you can check any result by hand. Results are estimates for quick checks; exchange rates are fixed reference rates.
Net price per carat = Rap list price × (1 + discount ÷ 100). A Rap price of US$7,200 at −35% gives US$4,680 per carat; multiply by the carat weight for the stone total.
For a round brilliant: average diameter² × depth × 0.0061. For fancy shapes: length × width × depth × a shape factor, for example 0.0062 for oval (using average diameter), 0.0083 for princess and 0.0080 for emerald. It is an estimate; girdle thickness changes the real weight.
Fine gold = gross weight × purity. 25 g of 22K (91.6%) contains 22.9 g of fine gold. One tola is 11.6638 g.
Convert what you issued and what came back to fine gold (weight × purity), then subtract. Loss % = fine loss ÷ fine issued × 100.
Yield % = polished carats ÷ rough carats × 100. Cost per polished carat = (rough cost + cutting and lab costs) ÷ polished carats.
1 tola = 11.6638 g, 1 Hong Kong tael = 37.429 g, 1 Thai baht (gold) = 15.244 g, 1 troy ounce = 31.1035 g and 1 carat = 0.2 g.
30 minutes on Google Meet with a solutions specialist. We map your trading, manufacturing and rough processing workflow and show the exact screens you would use. Times shown in your own time zone.