A market, measured carefully.
There is no live HiddenCarat price index yet. Six illustrative comparisons do not represent the diamond market, and we won’t turn them into one.
What you can explore now.
The homepage shows six sample price spreads with fictional sellers. Certificate pages demonstrate the same-stone ladder, evidence surfaces and flagged-data behavior. These pages are not investment guidance, appraisals, offers or verified market observations.
What a publishable index needs.
Licensed observations, deduplicated certificates, clear sampling dates, separate origin and grading-lab cohorts, magic-size-aware bands, sufficient observations and confidence bands. Thin cohorts must show their uncertainty or withhold an estimate. We won’t publish empty or misleading pages just to target search queries.
Open data, after validation.
The plan calls for a weekly public price index and retailer-markup dataset under CC BY 4.0, subject to feed licensing rights. No dataset is being released or relicensed today. High-frequency, per-certificate licensing is a separate future product.