Weights:

1 Troy Pound	12 Troy Ounces
1 Troy Ounce	31.1035 Grams
	480 Grains
	20 Pennyweight

Karats:

Karat	Fine	Percentage
24k	1000	100%
22k	917	91.7%
20k	833	83.3%
18k	750	75%
15k	625	62.5%
14k	585	58.5%
10k	416	41.6%
9k	375	37.5%
8k	333	33%

The purity of Gold is expressed in "karats" in Canada and the US, while Europe uses "fineness".

Value:

For up to date market quotes: Kitco