Another follow-up to blood diamonds: The New York Times offers Hollywood’s Multifaceted Cause du Jour, Marc Santora’s look at Hollywood’s engagement in the marketing or unmarketing of diamonds. Diamonds are love. Diamonds are a girl’s best friend....

Four years ago, I didn’t know anything about diamonds. Then I posted one ill-tempered rant about how annoying and even offensive I found the advertising for the diamond industry. And I’m not easily offended. I was immediately drawn into a...