We make it easy to sell your diamond jewelry

It’s quick, risk free and hassle free to find out the value of your diamond
  • Tell us about your diamond icon
    Step 1
    Tell us about your diamond jewelry
    You will be asked for the Diamond Grading Report number and general details about your jewelry (setting type, metal type etc.). Don’t have a Diamond Grading Report? Not to worry, we will send you a free and fully insured shipping kit and provide you with a free evaluation by our expert gemologists.
    Quick fact

    All members of our Client Care team are certified gemologists and can be contacted via call, text or email.

  • Get Guaranteed Offer Range icon
    Step 2
    Get a guaranteed offer range

    Based on the info you provided, we’ll email you a guaranteed offer range (takes 1-2 business days). The Mondiamo guaranteed offer range is the price we commit to paying you before we even see your diamond jewelry. More than 90% of our customers receive a final offer price higher than the midpoint of the guaranteed range.

    Did you know?

    Our global distribution network spans 28-countries and hundreds of buyers, affording us with real-time diamond prices.

  • Send Your Diamond Ring icon
    Step 3
    Send us your diamond jewelry for final evaluation

    Once you receive our offer, you will be able to request a free, trackable and fully insured shipping kit with all the packing materials (usually arrives to you in 1-2 business days). Drop the package off at FedEx or call for a pick-up. You can find your nearest FedEx location here.

    Quick fact

    We have a Block Policy Insurance that protects your item during shipping and while in our premises for the high-range of the offer we provide you.

  • Paid For Your Diamond icon
    Step 4
    Get paid the same day
    If you accept our final offer, we’ll issue an immediate payment. Alternatively, we will ship your item back to you, free of charge, no questions asked.
    Did you know?

    We offer you a choice of payment options between check and bank transfer.

Learn what happens at our evaluation center

Diamond magnifier

Not sure about something?

Check out our FAQs or call, text or email us.

We are here to help!

General FAQ’s

  • If you have provided us with a grading report from the GIA, EGL (US and International), IGI, AGS, GSI, GCAL, IIDGR, or HRD, we’ll provide a sight-unseen guaranteed offer range for your diamond jewelry based on the characteristics from the report. After physical examination, we guarantee that your final offer will fall within this range. Even better, more than 90% of our customers receive a final offer price higher than the midpoint of the guaranteed range. The guaranteed offer range that we send you is a net range, so you will not be charged any shipping, insurance, or hidden fees. Mondiamo’s fee is one of the lowest in the industry at 15%, but this is already removed from the range that we send you.

  • Owing largely to the notion that ‘diamonds are forever’ and their value does not depreciate, people are often shocked to find that diamond prices at retail differ greatly from true diamond value in the secondary market. Like any consumer product, diamond retailers add markups based on their location, the type of jewelry, fashion trends, the economic climate, and other factors. In the secondary market, we are bound by strict pricing indices based on the 4Cs (cut, carat, clarity, and color) when we value your diamond. The range that we have sent to you is computed using data from largest database of diamonds currently in the secondary diamond marketplace and we pull pricing for diamonds with the same characteristics as yours to determine our offer range.

    We understand that the difference between retail pricing and secondary markup pricing can be jarring and our certified gemologists are happy to answer any questions you might have about this.

  • We provide a guaranteed, sight-unseen offer range for any diamond jewelry containing at least one natural, untreated diamond weighing 0.45cts or larger, with I1 clarity or better. The diamond must be accompanied by a third-party diamond grading report from GIA, IGI, GSI, AGS, HRD, EGL (USA) or IIDGR. If you do not have a diamond grading report from one of these labs, or you only have an appraisal, you can still submit your item’s information and we will let you know if your diamond jewelry is eligible for our free evaluation service.

    Mondiamo does not buy lab grown diamonds.

  • While appraisals can give us an idea of your diamond’s characteristics, there is no single standard all appraisers abide by and one appraiser’s standard could differ from a gemological grading standard. Appraisals are also primarily used for insurance replacement values, which is not indicative of current market value. Though we cannot send you a guaranteed sight-unseen offer range using your appraisal, we can offer you a free evaluation. Upload your appraisal with your submission and send us your item risk free with no obligation. Our expert team will provide you with a final offer. If you are not satisfied, we will ship your item back at no cost to you.

  • Yes. Please use our online submission process and tell us as much as you know. Most fields offer an “I don’t know” answer option. If we are not able to provide you with a sight-unseen offer based on the information you have, we will send you a free and fully insured shipping kit to send us your item for a professional evaluation. If you are not satisfied with our offer, we will ship your item back at no cost to you, no questions asked.

  • Our team of certified gemologists physically inspects each item of diamond jewelry we receive. The majority of the value lies in the diamond. Beyond the 4C’s there are many other factors that affect the value of a diamond. Fluorescence, brilliance, scintillation, and symmetry are just a few of the things our expert team checks for when providing a valuation for a diamond. We also consider market demand for each stone. You can read more about the process in our Jewelry selling guide.

  • Yes, the market value of your setting and side stones will be calculated into the offer we share with you. The price you paid for the setting was mostly driven by its design and labor costs, rather than the actual cost of its metal and side stones, and as a result, the setting has a lower resale value. If you decide you’d like to keep your setting, we will unmount your diamond and ship the setting back, free of charge.

  • Absolutely. We’ve partnered with FedEx, Brinks and Malca Amit to ensure our shipments are fast, secure, fully insured and always trackable. Shipping in the U.S. is always free and includes a shipping kit with all of the materials you’ll need to get your item to us safely. Insurance covers any damage or loss up to the full amount of the declared value.

  • Yes! We are happy to work with international clients. Similar to shipping in the U.S., we partner with FedEx and international shipping is fast, secure, fully insured, and always trackable. Because of US customs and importation regulations, we are required to collect duty and import fees for diamond jewelry. We remove this from the offer range that you receive, so you will still know what you can expect to receive from your jewelry before sending it to us. If you have any questions about your specific location, please call, text or email our Client Care team.

  • While we don’t have a storefront, we welcome customers looking to submit their diamond jewelry in person to visit our office in midtown Manhattan. To schedule an appointment, please call our client care specialists at 877-478-0485.

  • We offer same day payment following acceptance of final offers with two simple payment methods to choose from. You can either have a physical check mailed to you or the money transferred directly into your bank account (via ACH for customers in the US and by wire for international customers). Please check with your bank to see if they charge fees for incoming transfers. Either method usually takes 2 - 3 days to arrive once you’ve accepted our final offer.