10k = 41.6% gold
14k = 58.3% gold
18k = 75% gold
22k = 91.6% gold
24k= 100% gold
The “spot” price is the current gold value
Say right now its $1500
Theres 20 pennyweights in an ounce (31.1 grams)
“spot” divided by 20 (an ounce) x the karat in number form x the percent your getting paid = how much PER pennyweight. Assume your getting 100% which is impossible but just to make it easy.
1500 divided by 20 times 416 times 100 = $31.20 per pennyweight of 10k
$31.2 times 20 (an ounce) = $624
At 1550 it would be $644.80 for an ounce of 10k