Save 10% off selected jewellery on the Blue Nile website.
To receive this offer, purchase must be charged in full to any VISA card. Offer does not apply to gift certificates, loose diamonds, Monique Lhuillier jewellery, Zac Posen jewellery, Build Your Own Diamond Jewelry®, preset engagement rings, polishing cloths, cleaning products, or sale merchandise. Offer may not be combined with any other offer or discount. Offer code VISAW2015 MUST be entered in cart or mentioned over phone at time of purchase. Purchase must be paid for with a valid Visa card. Offer subject to change, and is based on individual merchant's terms and conditions. Offer cannot be applied retroactively. Void where prohibited or restricted by law. Any taxes are the sole responsibility of the purchaser. Offer expires 3 PM US Eastern Time, December 31, 2015.
Also, you get cashback with CashRewards, but I'm not sure if you can stack it with this promo.
Blue Nile and ZOARA usually provide "discount" on ring settings or wedding bands. Would encourage anyone who is looking to try "negotiating" with them via live chat. Getting them to knock off 10% is not too difficult.