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# MadisonDia > MadisonDia is a Hong Kong luxury lab-grown diamond brand by Kardias Fashion Group Limited. All stones are D color, VVS clarity, 3EX cut, with IGI or GIA certification. Affordable luxury built on European brand heritage standards, sold direct from lab with no middlemen. Hong Kong Government registered Precious Metals & Stones Dealer (Cat. A) and "No Fakes" certified since 2014. MadisonDia specializes in certified lab-grown diamonds (人工ダイヤモンド) and custom fine jewelry. Every stone ships with its IGI certificate emailed before dispatch. Custom orders include CAD/3D preview before production and photo confirmation before shipping. Returns are 30-day unconditional with full refund and no fees. Finished jewelry includes one year of complimentary repair. The brand's parent company, Madison Avenue, has been an authorized dealer for Versace, Hugo Boss, and Moschino since 2012, operating a physical store shared with MadisonDia. The brand holds a 5.0 rating on BUYMA with 1,343+ verified reviews and partners with KOLs and celebrities across Japan, Hong Kong, and Taiwan. ## Core Pages - [About Us](https://www.madisondia.com/pages/about-us): Company background, Madison Avenue heritage, and what MadisonDia stands for. - [Frequently Asked Questions](https://www.madisondia.com/pages/frequently-asked-questions): Certification, shipping, returns, and custom order details. - [Shipping](https://www.madisondia.com/pages/shipping): Delivery timelines, methods, and pre-ship IGI certificate process. - [Refund & Return Policy](https://www.madisondia.com/pages/%E9%80%80%E6%AC%BE%E6%B5%81%E7%A8%8B%E5%92%8C%E9%80%80%E8%B2%A8%E6%94%BF%E7%AD%96): 30-day unconditional returns, full refund, no fees. ## Buying Guides - [什麼是實驗室培育鑽石 (What Are Lab-Grown Diamonds)](https://www.madisondia.com/pages/%E4%BB%80%E9%BA%BC%E6%98%AF%E5%AF%A6%E9%A9%97%E5%AE%A4%E5%9F%B9%E8%82%B2%E9%91%BD%E7%9F%B3/): Pillar guide explaining what lab-grown diamonds are and how they are made. - [培育鑽石如何挑選 (How to Choose a Lab-Grown Diamond)](https://www.madisondia.com/pages/%E5%9F%B9%E8%82%B2%E9%91%BD%E7%9F%B3-%E5%A6%82%E4%BD%95%E6%8C%91%E9%81%B8/): Pillar guide on selecting by the 4Cs, certification, and budget. - [Lab-Grown Diamond Engagement Ring Buying Guide](https://www.madisondia.com/pages/lab-grown-diamond-engagement-rings-buying-guide): Choosing 4Cs, settings, and budget for engagement rings. - [Ultimate Lab-Grown Diamond Certification Guide](https://www.madisondia.com/pages/ultimate-lab-grown-diamond-certification-guide): How IGI and GIA certification works and how to verify a report. ## Products & Collections - [Lab-Grown Diamond Rings](https://www.madisondia.com/collections/lab-grown-diamond-rings): Finished diamond ring collection. - [Round Lab-Grown Diamonds](https://www.madisondia.com/collections/%E5%9C%93%E5%BD%A2%E5%9F%B9%E8%82%B2%E9%91%BD%E7%9F%B3): Loose round brilliant lab-grown diamonds, D/VVS/3EX, 1ct from HKD $1,904. - [Eternity Bands](https://www.madisondia.com/collections/eternity-band): Lab-grown diamond eternity band collection. - [Lab-Grown Diamond Bracelets](https://www.madisondia.com/collections/lab-grown-diamond-bracelets): Lab-grown diamond bracelet collection. ## Trust & Certification - [HK Government Registered Precious Metals & Stones Dealer](https://www.cr.gov.hk/): Cat. A dealer, Registration No. A-B-26-05-10954. - [Hong Kong Government "No Fakes" Scheme](https://www.nofakes.gov.hk/): Official certification MadisonDia has held since 2014. - [IGI Report Verification](https://www.igi.org/verify-your-report/): Verify any MadisonDia IGI certificate. - [GIA Report Check](https://www.gia.edu/report-check): Verify any MadisonDia GIA certificate. ## Optional - [MadisonDia on BUYMA](https://www.buyma.com/buyer/7674768.html): Verified reviews and 5.0 rating. - [MadisonDia 日本語サイト](https://www.madisondia.com/ja): Japanese-language storefront. - [MadisonDia English Site](https://www.madisondia.com/en): English-language storefront. - [MadisonDia ภาษาไทย](https://www.madisondia.com/th): Thai-language storefront.