Things you need to know before purchase

🖐️ See Actual Diamond Size on Your Own Finger & Ear ▼

Carat weight alone doesn't tell you how a diamond will actually look on you — finger size, earlobe size, shape, and setting style all affect perceived size. Use our free visualizers to scale any carat weight against your own measurements before you buy.

💍 On Your Finger

Compare 0.5ct to 5ct against your real finger width and see how each carat size reads on the hand.

Diamond Carat Size Visualizer →

💎 On Your Ear

Slide from 0.1ct to 3ct and see the true millimetre width of a stud against a real earlobe, plus a carat-to-mm chart.

Diamond Stud Earring Size Guide →
💎 MadisonDia Premium Lab-Grown Diamond Standards ▼

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.
✨ Prong Style & Metal Color — Free Customization ▼

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

🎨 Choose Your Metal Color — Free

Every piece is available in white gold, rose gold, or yellow gold — the color is your choice at no extra cost, and pricing is the same whether you choose 9K or 18K.

 

White Gold

 

Rose Gold

 

Yellow Gold

Learn more about 9K vs 18K gold and metal colors →

💍 Choose Your Prong Setting

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

Four prong setting options: Round, Tab, Claw, and Petite Claw

✍️ Free Engraving

Add a meaningful inscription — a name, date, or short message — engraved into your jewelry at no extra charge.

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

📦 Shipping & Return ▼

Free Shipping on all purchases

💎 Loose Diamonds

  • Processing: 1–2 business days
  • Shipping: 3–8 business days (insured courier)
  • 30-day unconditional refund

💍 Finished Jewelry

  • Production: 5–15 business days
  • Shipping: 3–8 business days after production
  • Diamond portion refunded in store credits
  • Jewelry: USD $40 polishing & restock fee
  • 14-day refund window

Shipping details → Return & refund policy →

🏛️ Why Buy from Madison Avenue HK | MadisonDia ▼

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.

🔧 Free Repair Service

  • • Complimentary repair within the first year. After one year, repair costs are quoted separately.
  • • For side stones (if any, excluding the main diamond), one complimentary repair within the first year. Afterward, costs are quoted separately.
  • • Due to variations in craftsmanship, certain items may not be eligible for complimentary service. Excludes damage caused by human factors.