Lab-grown vs natural diamond filters, how do you handle in Magento?

The buyer cohorts are different and the SKU model has to reflect that.

• Distinct category trees, /diamonds/natural/ and /diamonds/lab-grown/ as parallel category branches. Don’t merge them; SEO + faceted-search clarity matters and natural-diamond buyers are a different cohort than lab-grown buyers.
• Origin attribute, EAV select attribute diamond_origin (values: natural, lab-grown). Used as a faceted filter on category pages alongside carat / cut / colour / clarity / shape.
• Dual cert authority handling, natural diamonds typically GIA-certified, lab-grown typically IGI-certified. Both surfaced via the same certificate_pdf attribute pattern with the authority shown on the cert button.
• Pricing transparency, show both natural + lab-grown variants of similar specs on a single PDP (cross-link between them) so customers can compare. Lab-grown is typically 60-80% cheaper for equivalent specs and customers want the comparison explicit.
• Disclosure compliance, FTC requires lab-grown to be clearly labelled (not just “diamond”). Build the disclosure into the PDP template + cart line + invoice.

Buyer cohort split in the data: lab-grown skews younger (25-38), price-sensitive, sustainability-conscious. Natural skews 35-55, traditional, gift-buyer (engagement / anniversary). Email segmentation + paid-search attribution should respect the split. Same Magento store, different audiences, different LTV.