Mondiamo, your trusted resource for selling engagement rings, diamond jewelry and loose diamonds
At Mondiamo we believe that you should feel good about selling your diamond jewelry; not overwhelmed, uneducated or uncomfortable.
Our team of experts brings together deep industry experience, a rigorous scientific approach and a global network to maximize the value of your diamond jewelry.
Our offices are based in the Midtown West neighborhood of New York City, and for your convenience we welcome appointments for those looking to submit in person. Learn more about Mondiamo’s process, meet the team and receive a same-day offer for your diamond jewelry. Interested in visiting? Call our client care specialists to schedule your appointment.
We've teamed up with Blue Nile, the largest and most trusted online diamond jewelry marketplace globally, to provide you a transparent, straightforward value for your diamond jewelry.
Meet our expert team
Senior Gemologist, G.G.
“Every customer is unique. I love taking the time to get to know each of them, to really understand their needs, and to educate them so they can feel good about selling their diamond jewelry."
Director of Client Care, G.G.
"Everyone at Mondiamo has the customer’s best interests at heart; whether it be maximizing the value of their diamond jewelry, providing guidance and insight, or offering advice, we pride ourselves in being aware of our customer's needs"
Client Care Associate, G.G.
"Our customers sell their diamonds for a myriad of reasons, but it’s rewarding to know that by purchasing their diamond, we’re helping them in some way – either big or small."
Diamond Buyer, G.D.
"I enjoy working closely with our Client Care team to maximize the value we can offer to our customers. We provide an easy to use service that allows our customers to sell their diamonds in a few simple clicks."
"What I love most about my job is changing what can sometimes be a stressful experience for a customer into a comfortable and positive one. My colleagues and I share a passion for providing outstanding service."
Pricing Associate, G.G.
“I'm proud to be part of a world-class team who have curiosity, a depth of knowledge and years of experience working in the diamond industry. We provide a service to people that takes the guess work out of reselling."
Why the hummingbird?
Our desire to focus on the good things in life is the reason we chose the hummingbird as our logo.
The hummingbird flies over 3,000 miles in its lifetime, boldly overcoming life’s challenges in search of the sweetest nectar. As you sell your diamond jewelry to seek out the sweeter things in your life, we aim to assist in your journey in a positive, friendly and transparent manner.
We want nothing more than for you to feel great about the sale of your diamond jewelry and, more importantly, what comes next, so we will always be attentive and respectful of your needs and concerns.