How We Rank

Independence First

Our business model is deliberately simple: users who want full access pay us for a pass. We do not accept affiliate commissions, referral fees, click revenue, or any other payment from the retailers whose diamonds we list. No retailer pays for placement, inclusion, a ranking boost, a logo position, or favourable scoring.

This is a core part of our value proposition. If we ever introduce a revenue stream that involves retailer payments, we will disclose it on this page and in our Terms of Service before it takes effect, and we will label the affected results clearly.

Retailer Inclusion

We include online diamond retailers that publish machine-readable inventory and certified diamond data at commercial scale. Inclusion is not negotiable and is not related to any commercial relationship with us. We currently track 100+ retailers across 15+ countries.

A retailer may be excluded or paused if we detect persistent price inaccuracy, fabricated certification references, or systematic attempts to block price transparency. We document any such decision on a case-by-case basis and are willing to re-include a retailer once the issue is resolved.

The Caratlytics Score

Every diamond in our database is evaluated by the Caratlytics scoring system. The overall score (0 to 100) combines four components:

• Quality 35%. Pure gemological quality: cut, polish, symmetry, fluorescence, proportions (table and depth), and girdle.
• Value 30%. Price relative to comparable diamonds (same shape, carat band, colour, clarity, and origin).
• Certification 20%. Grading laboratory strength and credibility (GIA, IGI, HRD, and others) weighted by market acceptance.
• Market 15%. Market position: how the listing compares against peer baselines and historical price movement.

The methodology is documented in our Terms of Service and may be refined as we improve it. We will not change the weightings in a way that advantages any retailer or commercial partner.

Default Sort Order

The default sort order in the diamond explorer and in Lucy's recommendations is overall Caratlytics score, descending. This is followed by retailer diversity as a secondary key, so equally scoring diamonds from different retailers interleave rather than clumping.

Users can choose a different sort (lowest price, pure quality, newest listings, largest discount, and so on). No sort option is weighted in favour of any retailer.

Data Freshness

Diamond inventory and prices are refreshed on a per-retailer schedule. Large retailers are refreshed multiple times per day; smaller retailers at least daily. Listings older than 14 days are automatically marked as sold or removed.

Each listing page shows the last-seen timestamp. Despite this, retailer sites are the source of truth: verify price and availability before purchase.

Disputes and Corrections

If you are a retailer and you believe a listing of yours is shown incorrectly, contact us at [email protected] with the listing URL and the correct information. We will investigate and correct verified errors.

If you are a consumer and you believe a score, match, or comparison is wrong, use the feedback link on any diamond page. We review feedback weekly.