How to calulate price of 18k gold from 99.9%gold(pure gold)?

gOLD PRICE SUPPOSE 592.60US$ PER OUNCE

Public Comments

1. 24K gold is about as close to 100% gold as you canb get. So 18K would be about 75% gold content.
2. The karat value of gold is determined by it's purity. The volume of a piece is divided into 24 parts. If the value is 24k that means 24 of 24 parts are gold. 14k is 14 parts gold and 10 parts some other metal. (copper, silver, etc.) An 18k piece is 18/24 parts or 75% pure gold so you would take the spot price (592.6 USD in this case) and multiply by .75. Other properties of the piece can affect it's value. Hallmark, craftsmanship, provenance, or antique value must also be considered and in the case of coins, their mintage. Gold nuggets, especially larger ones, usually fetch well above the spot price.
3. 592.6 times 3/4 will get you the price of 1 ounce of 18k. Which is about $444