Personal Attention: Huge Selection:

Finest Service:



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 expert 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’ve 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 J). 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.

#1 Source for GIA Diamond Online

Huge inventory of certified diamonds

  • Select your favorite loose diamond shape:

  • View our extensive diamond inventory:

  • -Basic Search or Detailed Search

  • Loose Diamonds Specials at the lowest wholesale cost.

  • Free appraisal, insured shipping and No-Risk return policy

  • Guidance from in-house GIA Gemologist on your diamond selection.

  • Choose from over 50,000 GIA certified diamonds at wholesale prices

  • Ideal and GIA Excellent cut diamonds

  • "Hearts & Arrows" and

  • GIA "Excellent cut" diamonds

  • AGS "Ideal cut" diamonds available

  • Expert 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.

  • Better Business Bureau (A+ Rated) & Jewelers Vigilance Committee members.
  • Listed under "Diamonds" category in the BBB Accredited Business Buyer's Guide (2014).

  • Our company fully support the United Nations "Kimberley Process" resolution.

  • - We sell only non-conflict diamonds.

  • Our honesty and fairness have been tested and earned online since 1999

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

    ..."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."

    From Jerri in AR

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

    OFFICE HOURS: M - F 9AM - 6PM (EST) By Appointment

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

    Copyright © 2015 #1 Diamond Source
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