Things you need to know before purchase

Carat weight alone doesn't tell you how a diamond will actually look on your hand — finger size, shape, and setting style all affect perceived size.

Use our free Diamond Carat Size Visualizer to see how different carat weights appear based on your own finger measurements before you buy.

Only International Gemological Institute (IGI) certified diamonds — ID EX / EX grade, each meeting our proprietary MISI™ (MadisonDia Ideal Sparkle Index) score of 80+.

MISI™ goes beyond the traditional 4Cs by evaluating advanced light performance — brilliance, fire, and scintillation — ensuring exceptional real-world sparkle, not just laboratory grading.

• ✉️ After purchase, we'll email the IGI certificate for your review.
• 💎 Not loving the diamond? Just say so — we'll show you 5+ replacements of the same size.
• 🔄 Still not satisfied? Get a full refund, no fees — guaranteed.

Make it truly yours. Every piece in our customizable collection comes with complimentary personalization options — no upcharge, no hidden fees.

💍 Choose Your Prong Setting

Select from four classic prong styles to match your personal taste — Round, Tab, Claw, or Petite Claw.

Note: Prong customization and engraving are available only on designs that support these modifications and have sufficient surface area. Eligibility will be confirmed before production.

Free Shipping on all purchases

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A trusted name since 2012 — Madison Avenue is a well-known physical luxury boutique in Hong Kong. With a long and reliable track record, you can also verify our 5-star rating on BUYMA.