Is There a Difference Between Tiffany, Costco Diamonds?

Diamonds are a $30 billion a year business. You can buy a diamond at the mall, at a fancy boutique and even online. With so many merchants selling them, how can you be sure you're getting a good stone at a fair price?

"Good Morning America" shopped at both ends of the spectrum, buying one diamond ring at Tiffany & Co. for $16,600 and one at Costco for $6,600.

Tiffany & Co.All diamonds come chocolate diamonds from deep within the Earth, but there are lots of different places you can go to get one. We started at Tiffany. We had thousan