Fair value starts from the global reference, COMEX gold or silver quoted in U.S. dollars per troy ounce. To compare it with a rupee-quoted MCX contract, the COMEX price is divided by 31.1035 grams per troy ounce, scaled to the local unit (10 grams for gold, 1 kilogram for silver), and converted at the USDINR exchange rate.
Import parity then layers landed costs on top of that converted price: customs duty, plus financing, premiums, and execution friction. The result is an estimate of what local bullion should cost if it simply tracked the cost of importing it. The basis — the observed MCX price minus this fair value — is what shows whether local metal is rich, cheap, or tracking.
Because the calculation is assumption-driven, the chosen duty and premium profile is always part of the read, and the freshness of each leg (COMEX, USDINR, and the local quote) is checked before the basis is trusted. A stale or estimated input downgrades confidence rather than producing a stronger opinion.