[Eccl 10:2]

I kinda answered my own question:

“An avoirdupois ounce weighs 28.3495 grams, while a troy ounce weighs 31.1035 grams. It’s believed that this is a throwback to the historic importance of precious metals in trade markets, and merchants’ need to have a standard unit of weight for gold, silver, gemstones and the like.”

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Is not gold usually measured in troy ounces?

If I buy an ounce of gold from a dealer, am I getting an avoirdupois ounce or a troy ounce?

[Vermont Lt]

You would get a Troy ounce.