Gold Troy Ounce weight system

The troy ounce is traditionally the unit used in pharmacies and in precious metals such as gold.

Currently all stock markets quote prices for precious metals in the troy weight system, so it is still in very common use.

I would venture that all gold labeled in ounces is troy ounces.

But since the troy ounce is slightly larger, But I doubt that is legal, I will take an educated guess and say you have to weigh it using the troy system or specify otherwise.

The Troy weight system, introduced somewhere around the year 900, is as follows

:1 troy pound = 5760 grains1 troy ounce = 1/12th troy pound (480 grains)1 troy pennyweight = 1/20th troy ounce (24 grains)There is also the apothocarie system where:1 dram = 1/8th troy ounce (60 grains)1 scruple = 1/3 drams (20 grains)The avoirdupois weight system, the more common system used in the US and introduced in England around the year 1300 is as follows:1 pound = 7000 grains1 ounce = 1/16th pound1 dram = 1/16th ounce