| Online retailer | Certifications | Return Policy | Key Advantage | Prices on Specific Date | Trustpilot Rating |
| Loose Grown Diamond | IGI, GIA, GCAL | 30-day free returns from delivery | Direct-from-manufacturer pricing with broad certified lab grown inventory | Round Cut Diamond, 4.00 carat,D, VS1, Price (USD): $1,162, reference date: August 21, 2026 | 5/5 (3204 reviews) |
| Brilliance | Certification type filtering referenced | 30-day returns tied to ship date | Broad shape-first browsing and strong review volume | Round Cut Diamond, 4.00 carat, D, VS1, Price (USD): $2,936, reference date: August 21, 2026 | 4.9/5 (4715 reviews) |
| With Clarity | Lab-grown diamonds referenced; conflict diamond policy referenced | 30 days from delivery | Home Preview option adds extra confidence for ring shoppers | Round Cut Diamond, 4.00 carat, D, VS1, Price (USD): $4,332, reference date: August 21, 2026 | 4.0/5 (37 reviews) |
| Clean Origin | Lab-grown diamonds graded by gemological laboratories based on the 4 Cs | 60-day return policy | Longer return window than most retailers listed here | Round Cut Diamond, 4.00 carat, D, VS1, Price (USD): $1,710, reference date: August 21, 2026 | 4.2/5 (299 reviews) |
| Ritani | Grading certificate from a respected third-party agency on each lab grown diamond, excluding preset lab diamond jewelry | 30 days, with mixed wording by shipment/delivery context | Transparent pricing messaging and in-person preview option | Round Cut Diamond, 4.00 carat, D, VS1, Price (USD): $1,223, reference date: August 21, 2026 | 3.5/5 (590 reviews) |
| Keyzar | Not specified | 30 days from shipping confirmation | Fast shipping messaging and customizable settings flow | Round Cut Diamond, 4.00 carat, D, VS1, Price (USD): $3,600, reference date: August 21, 2026 | 4.8/5 (1403 reviews) |
| Blue Nile | Over 100,000 independently graded diamonds referenced | 30-day returns from shipment date | Large established online jeweler with showrooms and design studio | Round Cut Diamond, 4.53 carat, D, VS1, Price (USD): $6,038, reference date: August 21, 2026 | 3.8/5 (1614 reviews) |