This deal has ended.
Through 12/11, SmartBargains has this coupon for free shipping on all diamond stud earrings. They also have this 12% off coupon for new customers, which may be more advantageous (shipping is $8.95). With the 12% off, 0.25 carat earrings are as low as $70.39 plus $8.95 for shipping. SmartBargains carries everything from 0.25 up to 2 carat studs for $6000. There is no sales tax (except MA, KY, NC).