Enjoyable about one engagement ring and its impact on four different characters living in four different eras. Sullivan was inspired to write this book after learning about the woman who coined "A Diamond is Forever" for Debeers in the middle of the 20th century, a time when men dominated advertizing. Sullivan did a great job keeping you guessing about how each of the tales would intertwine, but I did find myself a bit bored with some of the characters after awhile. A little too much background and not enough action. Light summer read with not too many lessons learned by any of the characters.