A best bet is the Sterling Silver Emerald-cut Couples Birthstone Name Ring (pictured) for $49.99 before the above coupon, and $39.99 after. With $5.99 for shipping, that's the lowest total price we could find by $32. It features two birthstone diamonds and two inscribed names of choice. It's available in sizes 6 to 12.
Note: These items won't arrive in time for Valentine's Day.