How this calculator works
The calculator starts from the live 24K gold price per troy ounce, converted to NZD 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.
New Zealand jewellery follows the British-influenced convention of 9K and 18K pieces, so 22K/916 gold is mainly encountered in imported jewellery. Fineness stamps such as 375 and 750 are used rather than a compulsory national hallmark.