Every piece.
Immutably
authenticated.

A paper certificate can be copied, altered, or destroyed. A GEMIA blockchain certificate is minted as a cryptographically signed token on Hyperledger Fabric — it cannot be altered, duplicated, or removed. Every change to the record (sale, re-valuation, estate transfer) is appended as a new immutable transaction, creating a tamper-evident audit trail that lasts as long as the blockchain itself.

Yes. GEMIA certificates include the grading report number, current market valuation, metal and stone specifications, and a full ownership history — all the data major UK insurers require for scheduled item cover. Many of our clients use their GEMIA certificate directly when adding jewellery to a home contents or specialist jewellery policy. We recommend checking with your specific insurer, but our certificates are structured to meet standard evidential requirements.

Your certificate lives on the Hyperledger blockchain — not on GEMIA's servers. Even if GEMIA ceased to exist, the token remains on the distributed ledger and can be independently verified by any node operator or blockchain explorer with access to the GEMIA channel. We also provide clients with a downloadable PDF and JSON export of their full certificate at the time of authentication, which is independently verifiable offline.

Absolutely. The xVAULT Re-Certification service (£180/item) is designed exactly for this. A GIA-certified GEMIA gemologist will physically assess your piece, update or create a grading report, and mint a new blockchain token recording your ownership and the current certified specifications. This is particularly valuable for inherited jewellery, antique pieces, or items purchased without documentation.

Certified provenance significantly improves resale liquidity and price. On the GEMIA Marketplace, blockchain-certified pieces consistently achieve 15–30% higher sale prices compared to equivalent uncertified pieces, because buyers have complete confidence in grade, origin, and ownership history. Buyers with GEMIA VIP Gold membership also receive a 10% resale advantage — meaning their certified pieces are actively promoted to our highest-value buyer segment first.

GEMIA uses Hyperledger Fabric — a permissioned, private blockchain — not a public chain like Ethereum. Your personal details are never written to the public ledger. Ownership records use anonymised wallet identifiers, not names or addresses. All personal data is processed and stored in compliance with UK GDPR (Article 6(1)(b)) on encrypted, ICO-registered infrastructure. The public-facing certificate shows stone and certification data only.