Diamonds of 1.00 carat or larger include third-party grading reports from the GIA or AGS. The Costco Trade-Off Jewelry Buying Guide Diamonds - Costco Wholesale
Buying a diamond ring at is often considered a high-value alternative to traditional jewelry stores, offering quality stones with a 100% Satisfaction Guarantee . While you sacrifice the "boutique experience" and customization, the pricing is typically 20% to 40% lower than comparable mall retailers. Quick Specs & Quality Standards
Costco maintains strict minimum quality requirements for all natural, untreated diamonds: