{"type":"firestarter.listing","listing":{"id":"lst_NINzPnxR","product_name":"Custom Marquise Diamond Ring","category":"Ring","description":"Design your custom engagement ring with the marquise cut diamond of your choice. Your ethical dream ring, made to order, just for you. \nDetails\n\n18 karat yellow, rose or white gold\n\nOur signature ethical gold: mercury-free and mined by indigenous women who are paid more than the international gold price\nMarquise cut diamond of your choice\n\nMade to order in 8 to 12 weeks\n\n\n\nCustom Marquise Diamond Ring\nDesign your own classic diamond engagement ring or self love ring.\nMarquise cut diamonds have a lot of face-up area, making them seem larger than a brilliant cut round diamond of the same weight. The elongated shape makes your finger look longer and thinner. \nChoose a marquise cut diamond that speaks to you and let's get started on your marquise diamond engagement ring. \nWe’re making this for you, from scratch\nYour custom marquise diamond ring will be made to order with the marquise diamond of your choice in around 8 to 12 weeks. You'll receive a photo before we ship it out. The price is for one finished ring in 18 karat eco gold.\nSince your marquise cut diamond ring will be made especially for you, we don’t accept returns on custom orders. You can read our return policy here.\nYour custom ring design\nMetal\nYou can choose from 18 karat yellow gold, rose gold or white gold. We use 18 karat ethical gold, which is mined and processed with traditional, mercury free, low impact practices by indigenous Dayak women in Central Kalimantan, Indonesian Borneo, who receive fair pay. Our 18 karat white gold is alloyed with palladium. This white gold has a warm gray color. If you prefer that white metal look, we recommend adding rhodium plating for $50.\n\n\n\nRing size\nWe use US ring sizes.\n\n\nNeed help with conversion? Download our free printable ring size guide.\nWant to check your size in real life? Use this eco friendly ring sizer.\nNot sure how to find her ring size? Check all these sneaky ways to find her ring size.\n\n\n\nSetting\nYou can choose between a bezel setting, which has the gol","images":["https://cdn.shopify.com/s/files/1/1205/9982/products/custom-marquise-diamond-ring-491339.jpg?v=1666151070","https://cdn.shopify.com/s/files/1/1205/9982/products/custom-marquise-diamond-ring-766858.jpg?v=1666151070","https://cdn.shopify.com/s/files/1/1205/9982/products/custom-marquise-diamond-ring-962222.jpg?v=1666151070","https://cdn.shopify.com/s/files/1/1205/9982/products/custom-marquise-diamond-ring-342136.jpg?v=1666151070","https://cdn.shopify.com/s/files/1/1205/9982/products/custom-marquise-diamond-ring-137079.jpg?v=1666151070","https://cdn.shopify.com/s/files/1/1205/9982/products/custom-marquise-diamond-ring-407179.jpg?v=1707716006","https://cdn.shopify.com/s/files/1/1205/9982/products/custom-marquise-diamond-ring-332159.jpg?v=1707716006"],"price":1000,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-18T20:45:28.486Z"},"share_url":"https://firestarter.network/l/lst_NINzPnxR","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_NINzPnxR' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Custom Marquise Diamond Ring' and a budget_max comfortably above $1000.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}