About MadisonDia | Premium Lab Grown Diamond Jewelry
Luxury, reimagined.
From fashion and fine jewelry to lab grown diamonds.
MadisonDia is the dedicated diamond line of Madison Avenue, a Hong Kong luxury house established in 2012 — built on the belief that every woman deserves to wear a diamond, without compromise on quality or transparency.
Founded in Hong Kong
Madison Avenue 14F opened its doors in Hong Kong's prime commercial districts as an authorized retailer for internationally renowned luxury houses, including Versace, Hugo Boss, and Moschino. Alongside this, we also offer fine jewelry and accessories from houses including Bvlgari and Dior. Our reputation was built on authenticity, meticulous quality control, and an elevated client experience.
Industry recognition & government certification
Madison Avenue joined the Hong Kong Retail Management Association (HKRMA) as an official member, standing alongside Hong Kong's most established retail brands. In the same year, we were awarded the Hong Kong Government's "No Fakes Pledge" certification — an official endorsement of our commitment to authentic, genuine merchandise, recognized by the Intellectual Property Department of the HKSAR.
Expansion into Japan
We expanded to one of the world's most discerning luxury markets, launching our official storefront on BUYMA. We quickly earned a perfect 5-star rating — a milestone that confirmed our belief that Asian women were ready for a smarter, more transparent approach to fine jewelry.
MadisonDia is launched
Drawing on over a decade of experience sourcing and curating fine jewelry, we launched MadisonDia as a dedicated line focused exclusively on diamonds — bringing our luxury retail expertise directly to lab grown diamonds, with no middlemen and no compromises. Madison Avenue's original luxury goods business continues to operate alongside MadisonDia today, both under the same company.
Expanding across Asia
Today, MadisonDia ships to customers across Hong Kong, Japan, Taiwan, Singapore, Australia, the US, Canada, and beyond — with a growing community of over 1,300 verified buyers and a perfect 5.0 rating on BUYMA.
For too long, diamonds have been positioned as rare privileges reserved for a select few. We believe that's wrong.
MadisonDia was created with a simple but powerful mission: to make fine diamond jewelry attainable — not exclusive. Every woman deserves to glow, to shine, and to celebrate herself without compromise on quality, ethics, or price.
We do this by working directly with leading laboratories, eliminating unnecessary middlemen, and passing the savings on to you — without ever lowering our standards.
IGI-certified, every stone. Every diamond we offer comes with an International Gemological Institute (IGI) certificate, independently verifying its quality and authenticity. You can verify your stone's certificate directly on the IGI portal.
MISI™ — our proprietary sparkle standard. Beyond the 4Cs, we developed the MadisonDia Ideal Sparkle Index™ (MISI) — a scoring system that evaluates a diamond's real-world light performance, brilliance, and fire. We only stock diamonds that score 80 or above.
Handcrafted in our own workshop. Every MadisonDia piece is set by our dedicated craftsmen, ensuring precision, structural durability, and a finish worthy of the diamond inside.
Hong Kong Government "No Fakes Pledge" certified
Our physical showroom in Tsim Sha Tsui is a verified member of the HK Government's official anti-counterfeiting programme. Learn about the No Fakes Pledge ↗
HK Government Registered Precious Metals & Stones Dealer | Cat. A:
Registration No.:A-B-26-05-10954 See our registration detail in Hong Kong Government - Custom official Website ↗
5.0 rating on BUYMA — no fake reviews
Every one of our 1,300+ reviews on BUYMA comes from a real buyer with a verified purchase record. We strictly reject inflated or incentivised endorsements. See our KOL & partner collaborations ↗
Factory-direct pricing — no middlemen
By sourcing directly from leading laboratories and handling production in-house, we offer top-specification diamonds at prices that consistently undercut traditional retailers.
IGI certificate review before every shipment
We send your diamond's full IGI certificate and specifications for your approval before anything is dispatched — so you know exactly what you're receiving.
Visit us in Tsim Sha Tsui, Hong Kong
Our shop at Hankow Centre G11 is open to everyone — no appointment needed. Come in, meet our team, view our diamonds in person, and experience the MadisonDia difference.
Address: G11, Hankow Centre, 5–15 Hankow Road, Tsim Sha Tsui, Hong Kong
Opening hours: Daily 12:00–20:30 (closed Saturdays)
※ G11 is on the shopping mall ground floor — not the office tower.
Transparency. No confusing markups, no hidden fees. Every price, specification, and certificate is openly shared — before you commit.
Ethical sourcing. Lab grown diamonds avoid the environmental and social impacts associated with traditional mining. Every MadisonDia stone is traceable, certified, and responsibly created.
Wearable luxury. We design jewelry meant to be worn every day — not locked in a vault. Our pieces move with modern life: from the office to the occasion.
For every woman. Diamonds should not be reserved for the few. Our direct-to-consumer model exists to make the finest diamonds accessible to anyone who wants them.
Ready to find your perfect diamond? Browse our collection, or book a private consultation at our Tsim Sha Tsui showroom.