Uncompromising Brilliance.
Wholesale Precision, Crafted in Tokyo.
Tokyo's premier B2B diamond source. We supply the world's finest GIA-certified loose diamonds and perfectly matched pairs to discerning retail jewelers globally.
5.0
Google Rating
Trusted by jewelers across Japan
50K+
Carats Sourced
Decades of wholesale volume
Global
Direct Sourcing
From India to Tokyo
Master Diamond Specialist Examining Certified Gemstone, Loose Diamonds and Jewelry
20+ years of experience in the diamond trade, sourcing from trusted resellers in Japan and helping them sell their products internationally for over 15 years. Our reach extends across key global markets including the USA, Belgium, Hong Kong, China, and India.
With offices in multiple locations, we maintain a strong international presence that allows us to serve our partners with unmatched efficiency and global expertise.
Uncompromising Quality in the Heart of Tokyo.
Located in the prestigious Ueno district of Tokyo, MODI DIAMONDS serves as the premier wholesale partner for discerning retail jewelers and private clients across Japan.
We operate strictly B2B, leveraging decades of global sourcing relationships to provide unmatched access to GIA-certified loose diamonds. Our commitment is simple: transparency, exceptional value, and an unwavering dedication to the highest standards of gemological integrity.
Strict GIA Certification
Every diamond independently verified by the Gemological Institute of America.
Wholesale Pricing Models
Direct B2B terms structured for retail jewelers and private clientele.
Conflict-Free Sourcing
Full Kimberley Process compliance with complete chain-of-custody documentation.
Dedicated B2B Support
A personal account specialist guides every acquisition from inquiry to delivery.
Premium Diamond Offerings
Curated selections tailored for high-end retail jewelers, manufacturers, and private bespoke commissions.
Loose Diamonds
Extensive inventory of GIA-certified round brilliant and fancy shapes. From commercial qualities to flawless investment-grade stones.
Matched Pairs
Meticulously calibrated pairs for earrings and side stones. Matched by eye and advanced optics for identical spread, color, and brilliance.
Bespoke Sourcing
Looking for a rare fancy color or a specific large carat weight? We leverage our global network to source exact client requests within 48 hours.
The B2B Buying Process
A refined, transparent approach to acquiring certified diamonds from trusted jewelers and sellers worldwide.
1. Seller Onboarding
We qualify your business credentials and gain a clear understanding of the inventory you wish to sell, your timeline, and your objectives.
2. Inspection and Evaluation
Our master gemologists meticulously inspect and evaluate each diamond on the 4Cs, ensuring precise assessment of quality and condition.
3. Valuation and Agreement
We present a competitive purchase offer with transparent valuation, verifying every GIA certificate before finalizing mutually agreed terms.
4. Secure Handover and Payment
Fully insured secure handover at our Tokyo vault, followed by immediate payment and the foundation of a long-term sourcing partnership.
Trusted by the Industry
Don't just take our word for it. Read what prominent jewelers say about partnering with MODI DIAMONDS.
"MODI DIAMONDS has transformed our sourcing. Their inventory in Tokyo is extensive, and their pricing allows us to remain highly competitive in Ginza. The grading is always perfectly accurate."
Boutique Owner
Tokyo
"When we need a specific fancy yellow or a perfectly matched pair of 2-carat stones, they are our first call. They consistently deliver within 24 hours. A truly reliable B2B partner."
Head Buyer
Osaka Retail Chain
"The level of transparency is unmatched. Being able to visit their Tokyo office and inspect the stones with their gemologists gives us absolute confidence in every purchase we make."
Custom Jeweler
Tokyo
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We Also Buy
Selling High-End Diamonds or Jewelry?
Modi Diamonds is actively acquiring premium loose diamonds and fine jewelry. We offer competitive valuations and a discreet, professional purchasing process for exceptional stones and signed pieces.