← All workCase study No. 13Shopify Storefront + Pricing Engine13 / 17

Carat & Kin.

A Shopify storefront for fine jewellery

A custom Shopify storefront and pricing studio that prices every piece from gold, stones, making charges and GST.

Client: Carat & Kin
Industry: Jewellery / E-commerce
Engagement: Build
Relationship: A client partnership

Carat & Kin

IThe ground

The brief.

Carat & Kin, a lab-grown diamond jewellery brand, needed its approved storefront designs turned into a Shopify store its own team could edit — and a dependable way to keep prices right. Every piece's price depends on gold weight and purity, diamonds and gemstones, making charges, discounts and GST, so pricing a whole catalogue by hand was not an option.

IIThe plan

Our response.

We built a custom Online Store 2.0 theme from the approved prototypes, with pages for customising a ring, trying pieces at home, virtual consultations, lab-grown education, a store locator and a wishlist. Behind it, a custom Shopify app on Railway runs a deterministic pricing engine, publishes each variant's price and a price breakup to Shopify, and reprices the catalogue in the background when rates change. A React pricing studio lets the team manage rate masters, making-charge and discount rules, GST and reconciliation, while App Proxy endpoints add delivery estimates, the price breakup, an Instagram feed and WhatsApp enquiries to the storefront.

Shopify Theme Development
Custom Shopify App
Pricing Engine
Admin Dashboard
Commerce Integrations

IIIThe buildStrategy → craft → engineering → care

Brick by brick.

Course 01
Prototype to Theme
Converted the approved HTML, CSS and JavaScript prototypes into a merchant-editable Shopify theme with 67 custom sections.
Course 02
Prices That Explain Themselves
A deterministic engine for gold, stones, making charges, discounts and GST, with a price breakup available to shoppers on every product.
Course 03
A Pricing Studio for the Team
Diamond and gemstone rate masters, pricing rules, versioned configuration with an audit trail, and background repricing with reconciliation and retries.
Course 04
Connected Commerce
HMAC-verified Shopify webhooks, Sequel247 delivery estimates, an Instagram feed and WhatsApp click-to-chat with a lead log.