The Steinmetz Pink Diamond. The price is $25,000,000.00. This superb gem has a definite size of 59.60 K or 11.92 grams. It was appraised by the intense observation and study of the American Gemological Institute as color Pink. According to their records, this diamond is the largest ever recorded pink diamond discovered. This superb diamond is being exhibited in the splendor of diamonds by Smithsonian Gallery.