Connect Socially

got diamonds?|we buy diamonds loose or in jewelry|secure, confidential transaction|immediate payment.

Call for Appointment 314-721-7210

About Prime Diam Co.

Why Prime Diam Co?

At Prime Diam we know that there are many different circumstances that will have you looking to sell your diamonds.

  • A trip of a lifetime
  • Upgrade to a bigger diamond or current fashion
  • Diamonds are forever, but some relationships are not
  • Wanting to turn unworn jewelry into cash
  • Uncomfortable financial situation
  • Turning an inheritance into cash

We at Prime Diam Co. understand and respect every situation that you may encounter. We offer you a private and secure setting to sell your jewelry. Your advantage is that in a private setting you will not encounter other customers during your personal appointment.

Prime Diam Co. has been in business in the St. Louis metropolitan area for more than 20 years. We are diamond wholesalers that have a combined experience of over 60 years in the jewelry industry. Our experience ranges from diamond cutting to designer jewelry which enables us to give you the best price for your pieces using current market value.

Prime Diam

What We Buy

Prime Diam Co. will buy loose diamonds, diamond rings, diamond jewelry and jewelry estates.

Lorem ipsum dolor
Lorem ipsum dolor
Lorem ipsum dolor
Lorem ipsum dolor
Lorem ipsum dolor
Lorem ipsum dolor
Lorem ipsum dolor

Frequently Asked Questions

Why Prime Diam Co?
Prime Diam has been in your community for more than 20 years. We are a professional diamond company that specializes in buying and selling diamonds. Unlike some other diamond buyers or gold buying companies we have the expertise and knowledge that they may not. We will share our knowledge with you and do the best of our abilities to educate you. Prime Diam Co. has global connections and the ability to buy items that others may not be interested in. Our secured office offers you a discreet, no pressure atmosphere to conduct your business. At Prime Diam we want you as our client.
How do I know how much my diamond is worth?
We suggest that you bring any paperwork that is pertinent regarding your jewelry. Certificates from Gemological laboratories (such as GIA, EGL or AGS), written appraisals, sales receipts or any other relevant paperwork will help the process. If you are unable to bring any types of paperwork with you we will educate you about your jewelry. We have a Certified Gemologist on staff along with the laboratory equipment necessary to evaluate your diamond(s).
If I have an appraisal with that help evaluate my diamond?
Your appraisal is usually written for insurance purposes only. The value listed on an appraisal can be about 50%-100% above the original retail price in the event that your diamond is lost or stolen. You cannot expect to receive the appraisal amount for your jewelry.
Do I need to schedule an appointment?
Yes, we require this for your privacy and so that we can give you the attention that is required to evaluate your diamonds.
What if I think you should be offering me more for my diamond?
We of course want you to feel confident in the offer we are presenting you. Our business is based upon repeat customers to buy and sell their jewelry so we want to keep doing business with you. If we cannot come to an agreed price or we feel that the diamond or jewelry is not something we would like to purchase we will suggest alternative options.

If you have further questions please feel free to contact us at (314)721-7210 or .(JavaScript must be enabled to view this email address)

Is your diamond certified by GIA? Get an instant Quote



We've work hard for each customer. Here is what they say about us.

I could not be happier!! I was able to get the highest price for my grandmothers old jewelry.

Becky - Ballwin, MO

I thought of selling my diamond on craigslist, but I wanted to find a private, secure place to sell my diamond. Prime Diam Co. was it.

Patrick - Fenton, MO

The staff of Prime Diam Co. was not only friendly, they educated me on how great my diamond was. I was given a great price for it.

Chris - St. Louis, MO
Happy Prime Diam Co. Customer

Our Office

By Private, Secure Appointment Only. Call Now.

7711 Bonhomme Ave.
St. Louis, MO 63105
Phone: 314-721-7210
Toll-Free: 1-888-PRIME-44 (774-6344)
Email: .(JavaScript must be enabled to view this email address)