Use sites like Pietra to find vetted jewelry manufacturers. Pietra gives you access to 1000+ vetted factories so you can avoid paying an agency.
Use sites like Pietra to set up order fulfillment. Pietra gives its members 30-50% off fulfillment and storage rates for small businesses and brands.
Use sites like Shopify to set up your e-commerce website. If you want something quicker, Pietra offers free e-commerce storefronts for members.