GIA / IGI cert PDF linking from PDP, how?

Cleanest pattern: cert PDF as a custom product attribute.

• EAV attribute, create certificate_pdf (file type) and certificate_number (text) and certificate_authority (select: GIA / IGI / HRD / GCAL / EGL) on the diamond / gemstone product type.
• PDP render, Hyvä template on the PDP shows a “View GIA Report” button if certificate_pdf is populated. Click downloads the PDF + opens a deep-link to the lab’s public lookup (https://www.gia.edu/report-check?reportno=<cert_number> for GIA, similar for IGI / HRD).
• Lookup verification, bonus: hit the GIA Report Check API at order placement and store the verified-at timestamp. Buyers know the cert was verified live, not faked.

For watches, brand authenticity equivalent: serial-number + box-and-papers + brand-warranty-card all as separate attributes, surfaced on PDP. Authentication services like Entrupy / Authenticate First can be wired in for high-value pre-owned watches.

For lab-grown diamonds: same pattern with IGI as the dominant lab. Differentiate from natural via a category attribute + faceted filter.

UX detail: surface the cert above the size selector on the PDP, not buried in a tab. Buyers verify the stone before they choose a size; flipping the order kills conversion ~12% in my A/B data.