GEMGEM is a trust-first marketplace for pre-owned fine jewelry and loose natural stones. Our Authenticity Guarantee means every item is made from genuine materials — real gold, real diamonds, real gemstones — as described. For C2C items, IGI authentication confirms the grade and specifications during or before your transaction.
What each badge means
| Badge | Meaning |
|---|---|
| IGI Authenticated | Item has been physically examined and graded by IGI. Certificate issued. Grade and specifications confirmed. |
| GIA Certified | Item carries a certificate from the Gemological Institute of America. Verifiable on the GIA public database. |
| Authentication on Purchase | Specifications are seller-stated. IGI authenticates after your purchase. 20% deposit required. Full refund if item does not pass. |
| Ready to Ship | Item is authenticated and all pre-dispatch requirements are met. Allows a short number of business days for logistics. |
| Fast Ship | Item is authenticated and will dispatch within 24 hours of payment confirmation. |
| Trusted Supplier | Item sourced from a verified trade supplier. Not a C2C listing. GEMGEM holds the supplier accountable for accuracy. |
At GEMGEM, customization is easy and expertly crafted to enhance your jewelry experience.
Exclusively for first-time buyers on GEMGEM: Enjoy a complimentary refurbishment service! Our experts restore your jewelry’s original brilliance and timeless beauty.
Get the perfect fit with our resizing service. We tailor your jewelry to match your style and comfort.
Buyer Protection Promise
Every item is covered by GEMGEM's Authenticity Guarantee — real gold, real diamonds, real gemstones, as described.
Your payment is held in escrow for 48 hours after delivery. Funds only release after your review window closes.
Not satisfied? Relist commission-free within 30 days of delivery. Active for up to 90 days.
Why IGI?
At GEMGEM, trust is our foundation. That’s why we partner with the renowned International Gemological Institute (IGI)—one of the world’s leading independent gemological laboratories for diamonds, gemstones, and jewellery grading.
For C2C items, IGI provides independent gemological grading and physical examination. Eligible pieces are assessed and graded by IGI during or before your transaction, and a full grading report is issued.
For C2C items, IGI physically examines and grades every item during or before your transaction. GIA or IGI certified items from trusted suppliers carry independent certification shown on every listing. Items that do not pass authentication are returned — your deposit is refunded in full.
“We created GEMGEM to make buying luxury pre-owned jewelry safe, affordable, and stress-free. Eligible items are independently authenticated under our process. If you decide to relist, you can do so commission-free — initiate within 30 days of delivery, and your listing stays active for up to 90 days. It’s pre-owned luxury — with a transparent process built in.”
Here are some of the most commonly asked questions from buyers. if you don't see what you're looking for, visit the Help Center for more answers.
