Provenance Proof
Provenance Proof
The Gübelin-led blockchain initiative for coloured stones and pearls
Provenance Proof is an open-source blockchain initiative launched by Gübelin Gem Lab in 2017 to create transparent, immutable records of the journey of coloured gemstones and pearls from mine to market. The project sits within the broader move by the gem and jewellery trade toward verifiable chain-of-custody documentation, and it is the principal coloured-stone counterpart to platforms such as Tracr and Everledger that focus primarily on diamonds.
How it works
The Provenance Proof platform records each transfer of a stone — extraction, sorting, cutting, grading, and transactional ownership — as a cryptographically anchored entry on a distributed ledger. Participants include miners, cutting houses, laboratories, dealers, and brands. Once recorded, an entry cannot be retroactively altered without the change being visible, which provides tamper-evidence and supports buyer confidence in the chain of custody. The system integrates with Gübelin's laboratory reports, so a stone graded at Gübelin can have its origin opinion and treatment determination linked directly to its blockchain record.
Notable participants
Adopters include Paspaley for South Sea pearls, Muzo Companies for Colombian emeralds, and a growing roster of brands and retailers in markets where transparency is a buying criterion. The platform is open-source, which Gübelin has positioned as a deliberate choice to encourage industry-wide adoption rather than create a proprietary moat.
Limits and prospects
Like all chain-of-custody systems, Provenance Proof verifies what is entered into it, not the underlying truth of the source data. The integrity of the record depends on the integrity of the participants, particularly at the mine and cutting stages where the chain begins. The platform addresses this by working with vetted source-of-record participants and by integrating laboratory verification at multiple stages. Adoption remains uneven across the coloured-stone trade, but the trajectory is toward broader acceptance.
In the trade
For brands and retailers building responsible-sourcing programmes, Provenance Proof is one of the principal infrastructures. For buyers of fine coloured stones, a Provenance Proof record alongside a laboratory origin report is the strongest current package of independent provenance documentation.