Costco offered 9.5 mm Tahitian Pearl &0.40 ctw Diamond Ring at $0.00. On 2012-06-30, Costco reduced price by $50 from previous $999.99. It's the best offer since 2012-06-30. That was also the latest price drop.which was higher than today's price. This offer might be expired. The last price tracking was done on 2013-07-01.