Evidence-led valuation
Purpose-aware analysis that keeps retail asking prices, wholesale transactions and other reference layers distinct.
Explore the pricing frameworkGlobal gemstone market intelligence
Evidence for better gemstone decisions.
GEMNYX gives gemstone professionals, insurers, investors, institutions, jewellers and advisers a clearer market view for valuation, insurance, research and portfolio decisions—built on defined evidence, transparent boundaries and auditable records.
We do not treat a retail listing, wholesale transaction, auction result and published reference as interchangeable evidence.
Auction-average indices
GEMNYX Market Evidence Index
Mozambique mixed-quality ruby
228.95February 2026 included auction · base June 2018 = 100. Click for index details; October 2026 is shown separately in the history.
Evidence cells
Separate tiers
Release control
Source-bound
Published level
Three series
Composition-unadjusted auction-average indices, not investment returns. Data courtesy of Gemfields auction results.
144,215
Verified D2C retail listings
53,829
Held D2C research records
78,841
Verified wholesale transactions
500,000+
Stones in inventory datasets
24,431
Coloured-gemstone catalogue records
Coverage statement as at 8 November 2026. Held research records are retained for future comparison work and excluded from pricing and valuation signals. Coverage refers to retained evidence, not confirmed current stock or universal eligibility for valuation or an index. Held catalogue records are a subset of held research, not additional coverage.
What GEMNYX is built to do
Useful market intelligence without false precision.
Market evidence
Explore source-specific auction indices and the consumer asking-price index in development, with clear evidence boundaries.
View the auction indicesInstitutional documentation
Auditable evidence packages, clear data boundaries and versioned methodology for insurers, institutions and advisers.
Read data & methodologyMarket evidence index
Auction indices — available
Auction results, now easier to explore.
Explore separate Zambia emerald and Mozambique ruby auction-average series, with dates, prices and source-linked explanations. These rough-auction measures stay separate from consumer asking prices.
View the auction indicesConsumer asking-price index — in development
GEMNYX Consumer Asking-Price Index
We are building a separate index to track advertised consumer prices for loose coloured gemstones. Initial work focuses on ruby, sapphire and emerald, with comparable stones grouped by size, treatment and cut. It will measure asking-price trends—not confirmed sales or individual valuations.
Explore the index in developmentEvidence, explained
Built for scrutiny, not just a headline number.
GEMNYX combines verified D2C retail listings, held research archives, verified wholesale transactions, inventory datasets, auction realisations, published price references and provenance data. Each layer has an intended use and is kept separate when it cannot support the same conclusion.
Independence and audit trail
Methodology changes, data boundaries and evidence packages are recorded for review.
How the data is governedLooking for research, methodology or institutional valuation context? Start with the evidence framework, then use the relevant controlled workspace.