The ring is by De Grisogono. It is a blue sapphire surrounded by 107 blue sapphires and 224 white diamonds in white gold. So going onto my Christmas wish list (in the words of Cher Horowitz, as if!) via Rings
Couture Précieuse ring Magnificent Adornments Inspiration in Crafted white gold set with 1 oval-cut rubellite and 120 brilliant-cut diamonds by Piaget. Via CIJ Jewelry Magazine. (Board: Put a Ring on it.