How this calculator works
The calculator starts from the live 24K gold price per troy ounce, converted to CHF at the current exchange rate. Your weight is converted to grams (1 troy ounce = 31.1034768 g, 1 tola = 11.6638038 g), and the value is adjusted for purity — the multiplier is simply the karat divided by 24, so 22K/916 gold uses 22 ÷ 24 ≈ 0.9167. The formula: value = grams × pure gram price × purity, plus any premium and minus any discount you enter.
Swiss fine jewellery and watch cases are predominantly 18K (750), a purity that balances prestige with durability. Precious metal articles are controlled under Swiss hallmarking law, with the St. Bernard dog head mark certifying official control of watch cases.