Personal Attention: Huge Selection:

Finest Service:

Recent Testimonials:
Early Testimonials:

Family Owned Loose Diamonds Wholesaler


We are master loose diamond cutters with multi-generation experience in the wholesale diamond jewelry industry. #1 Diamond Source only sells natural diamonds that are laboratory certified and our GIA Graduate Gemologist provides personal guidance on your diamond purchase. Our company sells diamonds loose or we can custom set your diamond choice at our in-house factory. We also offer custom diamond cutting and repair service on all cuts, shapes, and sizes and provide free consultation and advice on polished and rough diamonds. High quality rare and large diamonds is our specialty.

We are "A+" rated by the Better Business Bureau and are members of the Jewelers Vigilance Committee. On the internet since 1998, we have offered our exceptional service and products online directly to the public at wholesale prices. All our diamonds come with an independent lab certificate and a written guarantee to be conflict free diamonds originating from ethical and socially responsible sources.

Our huge inventory with over 50,000 stones includes colorless and near colorless diamonds (GIA: D to K). Our loose diamonds range in clarity grade from Flawless to "Slightly Included" (GIA: FL to SI2). The Diamond shapes that we offer are: Round, Oval, Princess, Pear shape, Marquise, Heart shape, Radiant, Cushion, Emerald cut, and Asscher (square Emerald). We can custom supply most other shapes upon request. #1 Diamond Source does not sell artificially treated or clarity enhanced diamonds. We only sell 100% natural daimonds.

#1 Source for GIA Diamond Online

bulletHuge inventory of certified diamonds

  • Select your favorite loose diamond shape:

bulletIdeal and GIA Excellent cut diamonds

  • "Hearts & Arrows" and
  • GIA "Excellent cut" diamonds
  • AGS "Ideal cut" diamonds available

bulletExpert advice, personal and caring service
  • Guidance in person from a GIA Graduate and diamond jewelry expert.
  • - We do not drop-ship diamonds indirectly.
  • Custom design and set your diamond at our in-house factory.

bulletBetter Business Bureau (A+ Rated) & Jewelers Vigilance Committee members.

Essential Diamond Education and Guidance
4 Cs - Loose Diamond Value Factors
Essential Diamond Purchase Education and Guidance
bulletLearn about the four main factors which determine diamond value.
bulletLearn about your favorite diamond shape.
bulletLearn about buying loose diamond online at the best value and lowest risk.

BBB Review (4/4/2018)
Working with Ron was such a great experience, I Iive in Dallas and he is located in New York but despite this, communication was perfect. The final product was stunning. I would refer him to anyone and use him in the future for sure. Great experience.
-- Danny (from Dallas, TX)

..."Talk about "WOW!". The marquise diamond ring arrived safe and sound but I was not prepared for what I saw... the engagement ring is breathtaking. It is everything you represented it to be and the setting is exquisite.
Thank you so much for your patience and guidance in helping us with our selection and the great wholesale price."

-- Jerri and Bill from AR (6/24/2003)

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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 A+ 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 © 2018 #1 Diamond Source
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