How the gram price is derived
Although Swiss shops quote per gram, the global market quotes gold in US dollars per troy ounce. One troy ounce equals exactly 31.1034768 grams, so the pure gold (24K) gram price is the ounce price divided by 31.1034768, converted to CHF at the live exchange rate. Lower purities are then a simple multiplication: 22K/916 is the 24K gram price × 0.9167, and 18K is × 0.75.
Switzerland is the world's refining hub: PAMP, Valcambi, Argor-Heraeus and Metalor together refine a large share of global gold. Dealers quote in francs per gram, ounce and kilogram, converted from the USD benchmark at the live USD/CHF rate.