Marilyn confirmed for us the obvious: Diamonds are a girl’s best friend. But at the Peninsula, ladies (and gents) can get their fill of rubies, emeralds and sapphires, too. The spacious indoor/outdoor spa is the first in North America to use Shiffa precious gem oils, which contain micro-fine fragments of the aforementioned sparklers. The Shiffa services on the menu ($195-$385)—massages and body scrubs—can be customized with your gem of choice, each of which comes with its own special healing powers: Diamond is for balance and harmony, emerald for stability and strength, ruby for stimulation and vitality, and sapphire for peace and tranquility. We’re not sure if all that bling actually works wonders on your skin (let’s face it, some of these treatments were created for the very rich, who get very bored), but a scrub-down with diamond dust sure feels luxurious.