Though the average specimen in captivity might live 25 or 35 years, an old koi named Hanako, from Mino province in Japan, has been shown to be over 215 years old based on analysis of her scales, and other 100+ year old fish are known from the same pond. Koi, like wild carp, can grow to 36 or more under perfect conditions.
The gold and silver medals weigh 412 grams (0.9 pounds) and the bronze medal weighs 357 grams (0.78 pounds). They are the biggest and heaviest summer Olympic medals ever made.
Set your digital kitchen scale to grams and weigh the 14 karat jewelry first. Pennyweight is the standard measurement used to weigh and value gold and other precious metals. There are 20 pennyweight in every ounce and 1.552 grams in every pennyweight.Divide the weight of your gold in grams by 1.552 to find its equivalent in pennyweight. Since 14 karat gold in only 58.3 percent gold, multiply the total pennyweight by .583.The result is the amount of pure gold in your jewelry.eigh your 18 karat gold next and find its total in grams. Multiply the gram weight by 1.552 to find the weight in pennyweight. Since 18 karat jewelry contains 75 percent gold, multiply the pennyweight by .75 to find the pennyweight of the gold content.