Platinum and gold are the top choices for engagement rings. The former will cost you—a simple platinum band can cost nearly $600 more than a comparable one in gold—but many brides feel the price is worth it. Platinum is a far more durable metal. It will show fewer nicks and scratches, and platinum prongs will hold a stone more securely. As for color, some people believe that yellow gold casts an unflattering light on the diamond, while others prefer the hue's warmth and traditional look.

.5-carat brilliant-cut round diamond with brilliant-cut diamond accents in 18kt yellow gold ($5,600) and .39-carats of brilliant-cut round diamonds in platinum ($3,550), Suzanne Felsen; 323-653-5400.