Fast – Secure – Immediate Payment

Free Evaluation

Visit us at our secure showroom for a free appraisal.

No Obligation Offer

Our GIA trained staff will offer a no obligation risk free offer.

Secure Payment

We pay immediately with all excepted offers.

Brands We Buy

Let us purchase your luxury brands with our peace of mind buying process

Over $100 million in transactions
For over 35 years, we are an established buyer that is well known in the Bay Area, as well as in the U.S. and internationally. We have been an established and successful diamond buyer with global trade connections in Antwerp, Tel Aviv, Mumbai, Hong Kong, and other diamond trade centers. We specialize in buying diamonds directly from the public and have the best connections to either direct consumer channels or international diamond markets. We have bought and sold large quantities of high-quality precious gems for over 35 years and that is why our knowledge and expertise will maximize your payout.
Guaranteed Best Results
Union Square Diamond Buyers: An established and trusted business for over 35 years! People sell to us because we pay more for your diamonds and fine jewelry. Our vast experience as diamond and jewelry buyers can help you when it comes in selling your jewelry, and selling your Rolex and other luxury timepieces. Our GIA graduate gemologists are here to help you determine the value of your jewelry. Contact us to sell your large diamond or diamond engagement ring. Union Square Diamond Buyers was not created just to take advantage of today’s high gold prices and close the door as soon as the rush is over. We are here to provide yet another service to our customers when their jewelry is no longer satisfying their needs. Contact our expert valuation team.


Highest Price
We can help you sell your jewelry! We have been diamond buyers and jewelry buyers for over a quarter of a century. We have the knowledge and expertise to evaluate your valuables and offer the best prices! We offer the most cash for your diamond, fine jewelry and engagement rings. Call 1 (800) 424-GEMS (4367) for an appointment, a phone consultation or a free expert evaluation. Our expertise as large diamond and jewelry buyers means more cash for you when trying to sell. Union Square Diamond Buyers offers a process that is fast, discreet, and safe. Our showroom is conveniently located close to Union Square, close to parking, BART and all major banks. Come in and sell a diamond ring or sell your jewelry to an established and well-known business. Selling your jewelry to a trusted and established business will give you the highest payout. Many of our clients search the web using terms such as “diamond buyers” and get a lot of confusing results. We can provide one of the easiest processes to ensure you get the best price for your engagement ring or fine jewelry. Contact us to sell your diamond or sell your diamond engagement ring or sell your Rolex.


Pink Diamond Prices Appreciated 116% Over the Last Decade

Prices of pink diamonds have more than doubled over the last decade, outperforming other color diamonds, according to a report Monday. From 2010 to 2019, pink diamonds appreciated 116%, compared to an 81% jump for blue diamonds and a 21% for yellow diamonds. Overall,...

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Designed trademarks and brands are the property of their respective owners. Union Square Diamond Buyers is not affiliated with Rolex S.A., Rolex USA, Cartier, Patek Philippe, Vacheron Constantin, or any of their subsidiaries, or any of the other brands we purchase.

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