Service at Jonathan's Watch BuyerSergio Nuncio prides himself on the service and services that he offers his customers at Jonathan’s Watch Buyer.  As a watch buyer and collector, Sergio is well versed in the buying and selling of vintage, new and gently worn Rolex models, Cartier watches, Vacheron Constantin, Patek Phillipe, Piaget, IWC, Concord, Tag Heurer, Breitling and many others.  Whether you need your watch repaired, need a cash value appraisal or are interested in a trade, Sergio can help you and guide you in the right direction.

Watches to Sell and Buy

Jonathan’s Watch Buyer doesn’t just buy watches, we also sell watches.  The brands that we sell are all put through extensive testing to make sure that the product that you are getting is in working order, and they all come with a one year guarantee and warranty on parts.  We also carry many new models as well, such as Tag Heurer and Rolex.  If you don’t see a watch that you are looking for, please contact Sergio at (832)277-5725 and he will be able to locate it for you.

Estate Jewelry, Antique Jewelry or Other Fine Jewelry

Jonathan’s Watch Buyer’s sister site, Jonathan’s Diamond Buyer purchases all jewelry types from antique and estate jewelry to modern jewelry.  We are always searching for rings, bracelets, necklaces and much more and look for brands such as Tiffany & Company, Cartier, David Yurman, Chopard and Chanel. 


Jonathan’s Diamond Buyer specializes in buying diamonds of all shapes, sizes and carat weights.  As a diamond buyer, we use GIA standards to grade the diamond you want to sell.  We will buy your diamond for the best price, based on cut, clarity, color and carat weight.


If you have broken or unwanted gold and need cash fast, sell it to Jonathan’s Diamond Buyer. The process is safe, quick and highly satisfactory!

At Jonathan’s Watch Buyer and Jonathan’s Diamond Buyer, our goal is to make the selling of your valuables as easy and painless as possible.  If you are interested in selling gold, diamonds, fine jewelry or watches contact Sergio Nuncio at (832)277-5725 or at or



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