Top quality jewellery website are extremely complex to development and lot depends on detail requirement analysis
Here is the tentative estimate
Full fledged diamond and jewellery e-commerce store on the latest version of popular open source e-commerce platform eg. Magento, OpenCart, Prestashop, Shopify, Woocommerce
Range: $8000 - $15000
Adding a module like build a ring or Rapnet/IDEX integration in an existing website: $1800 - $4000
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