Beverly Hills jeweller JUDITH RIPKA is so thrilled Nicole Richie chose to wear one of her rings on the cover of her first novel, she's named the bauble after the socialite/actress.

Richie wears the Ripka ring on the cover of THE TRUTH ABOUT DIAMONDS, which has brought the gem designer a great deal of interest.

Ripka says, "We love the book, which has gotten us an unbelievable number of calls from potential clients.

"We're renaming the ring on the book's cover. It's now called The Nicole and retails for $9,000 (GBP5,000).