What does one troy ounce mean?
One troy ounce equals 31.1034768 grams. Multiply the fine-gold price per gram by that number to convert it. The ordinary ounce used for other goods is a different unit.
For coins, compare fine-gold content rather than gross weight alone. An alloy coin can weigh more while containing exactly one troy ounce of gold. Check the specification of the particular product.
Metal value is not a dealer quote
Metal quotes come from gold-api.com, with currency conversion from Frankfurter. The reference is not a binding purchase or buyback price. Compare total cost, fine weight, quote time and all charges.
Worked examples: compare spot and dealer prices
Tax treatment depends on the product and individual circumstances. Check the statutory conditions in § 25c UStG and § 23 EStG.