U.S. scales will measure 28 grams per ounce, while gold is measured at 31.1 grams per Troy ounce. Some dealers may also use a system of weights called pennyweight (dwt) to measure a Troy ounce, while others will use grams. A pennyweight is the equivalent of 1.555 grams.

The gold will be measured by the India is karats, grams, and bar values

By the Troy ounce or by the gram, unless you are trying to sell to a shop and then they will try to confuse you with the outdated pennyweight system.

Ugh, kemosabe. By the pound.