29,650 US dollars in 2015 According to www.statista.com article on per carat diamond prices In 1960, the average price for such a diamond stood ot some 2,700 U.S. dollers. Since then, the demand price has increased more than tenfold, to if the price for per carat diamond continues rking at the same average annual rate at which he's been increasing between 1960 and 2015, the price in 2050 will be inerente decimal places for any intermediate calculations, from the default 2 to 8 or even higher only round your final answer to TWO decimal places for example 10,000 233