Update 3pm EST: the order deadline has past. Top online jeweler Blue Nile has a Valentine's Day Shipping Deadline today at 3pm EST. FedEx Priority Overnight is free on all orders. Blue Nile is the largest online jeweler, having sold over 50,000 engagement rings. They buy diamonds through the same wholesalers that Tiffany's does, but can sell for 20-40% less. They have a very well-explained website, guiding men (mainly, including myself) to an informed purchase without the sleazy salesman. This pair of 1/3ct Diamond Stud Earrings in 18k White Gold are $300 before 10% off reference code VISAW18 for Visa cardholders or reference code WISH07 for those with American Express (the code does not apply to diamonds with "build-your-own" jewelry because the prices are already so low). Blue Nile has no sales tax and a fully guaranteed 30-day return policy.