|In April, a 25.5 ct. blue diamond was recovered by Petra Diamonds Limited at the Cullinan mine in South Africa.|
The rough stone sold for $16,910,180 (US$663,144 per carat).
How Diamonds Became Forever - NY Times
“A Diamond Is Forever,” has appeared in every De Beers engagement ad since 1948. In 1999, two weeks before the never married Ms. Gerety died at the age of 83, Advertising Age named it the slogan of the century.