Personal Attention: Huge Selection:

Finest Service:


Recent Testimonials:
Early Testimonials:

Wholesale Diamonds with 25 Years Experience!

Certified Loose Diamonds Online Since 1999


GIA Certified Conflict-Free Diamonds Without Guesswork
Our GIA Graduate Gemologist Examines Your Every Selection

Custom Engagement Ring Handcrafted in our factory to your exact specifications

We are a family owned diamond wholesaler and jewelry manufacturer. We custom set your loose diamond choice in most any setting style that you like. Just tell our our GIA Graduate Gemologist what you wish for and we'll make it at our in-house facility to your exact specifications for the best wholesale price. Our main office and factory location is in the NY Diamond District.

ENGAGEMENT SETS DIAMONDS & JEWELRY Pave Engagement Ring Diamond Studs Pendant Solitair Matching Bands Diamond Studs - Princess
Why is #1 Diamond source a cut above the rest?
• No-Risk Return - Our loose certified GIA diamonds carry a 30-day guarantee.
• Finest Service - We help you find the perfect GIA certified diamond at the lowest wholesale cost.
• GIA Gemologist - All loose diamonds are certified and examined by our in-house Gemologist.
• Vast selection - Over 50,000 certified diamonds with many excellent, ideal cut, and large stones.
• Lowest cost - Selling wholesale to the trade from 1991 & online to the public from 1999.
• Free shipping & appraisal - No cost for insured FedEx® and a detailed insurance appraisal.
• Our customers love us - Selling online since 1999 with a consistent perfect record.
• Diamond cutting & repair - Recut, polish or fix your diamonds to optimize their look & value.
• We buy diamonds - Trade-up or sell your loose diamond or diamond ring.
• Conflict free diamonds - Guaranteed to originate from ethical, socially responsible sources.
• Members - Better Business Bureau, Jewelers Vigilance Committee,
"...It is rare to find people in the diamond business who take so much joy from simply doing the best job for their customer that anyone could ever do.

At some point in the process I was struck by the extraordinary drive shown by you both to not only meet your own high standards but to meet mine as well. The loose diamond is exquisite, and not simply because it is a GIA graded D Flawless stone..."

- Carl in San Antonio, TX


CORPORATE OFFICE*: #1 Diamond Source 36 W. 47th St. New York, NY 10036

OFFICE HOURS: M - F (By Appointment)

* Selling at wholesale to the trade and retail to the public.

BBB A1 Rating Jewelers Vigilance Committee Rated: Jewelers Board of Trade Certified: Gemological Institute of America Free Insured FedEx Accept: Visa Accept: Master Card

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Copyright © 2015 #1 Diamond Source
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