Sarah & Sebastian

Premium e-commerce for an elegant Australian fine-jewellery house — fast, polished and conversion-optimised.

The brief

Sarah & Sebastian sells fine jewellery where average order value sits north of $480. Their previous Shopify theme was beautiful but slow (LCP > 4.5s on mobile), and the checkout had three friction points the team had been "meaning to fix" for 14 months.

What we built

• Custom Hydrogen / Shopify theme — sub-1.8s LCP on AU 4G.
• One-page checkout with Shop Pay, Apple Pay, Afterpay, Klarna.
• Bespoke product configurator for engagement rings (metal, diamond size, band style).
• Klaviyo flows — abandoned cart, browse abandonment, post-purchase, VIP tier.
• Editorial content modules for craft + sustainability storytelling.
• Loop returns + Judge.me reviews integrated into PDP.

The numbers

• +47% AOV within 90 days post-launch (configurator-driven upsells).
• 2.8× mobile sales — same traffic, faster checkout, higher trust.
• 97 Lighthouse Performance on PDP, on 3G throttle.
• Email-attributed revenue up 3.1× via Klaviyo flow rebuild.

"They delivered a website that is not only visually elegant but also performs flawlessly across all devices. Their ongoing support and marketing insight have been invaluable."

Sarah & Sebastian · Jewellery · Australia

Tech stack

Shopify Plus · Hydrogen · Liquid · TailwindCSS · Klaviyo · Loop · Judge.me · Cloudflare · Vercel.