15 carat gold has a purity of 625, which means that 62.5 percent of a piece is gold. 15 carat gold is often available in either brilliant yellow or rose gold. Gold is the most expensive metal on earth. Prices for gold have been increasing because of its popular use as an investment asset and its importance to the industry. There are other elements used in gold processing such as silver, copper, and zinc. The amount of gold in 15 kt is approximately 0.39 oz. This equals about 10 grams. The standard weight for a troy ounce of gold is 31.1035 g. So, 10 grams of 15kt gold is 37.5 troy ounces. One karat gold is standard weights of 331.25 grains (16.511 g). So, one pound of 15/16th gold is 454.375 grains (22.222 g). One grain is 1/1250 of a pound. One troy ounce of 15k gold is 31.103 grams. So, one kilo of 15k gold is.477 ozs or 15.5 grams. One hundred grams of gold is about 3.5 ozs. Or you can say 300 grams of gold is about 11.5 ozs.