Sources & formula
Spot prices: gold (XAU), silver (XAG) and platinum (XPT) in USD per troy ounce from gold-api.com.
Exchange rates: ExchangeRate-API, refreshed several times a day.
Formula: spot ÷ 31.1034768 × FX × purity × grams. Purities: 24K 0.999, 22K 0.916, 21K 0.875, 20K 0.833, 18K 0.750, 14K 0.585.
Limitations: these are international parity rates. Local sarafa boards add premiums for duty, taxes and supply; jewellers add making charges. Always confirm before trading.
Publisher: Bringoo Tech, a jewellery-software company with offices in Faisalabad, Lahore and Oman.