Diamonds in Castro Valley, CA

Serving the Castro Valley areawith the best selection for Certified Loose Diamonds, and a curated catalog of the finest Diamond Jewelry. Browse our spectacular collection of high-quality loose diamonds in every diamond shape and carat weight, including hard-to-find larger carat stones and a full range of unique diamond shapes. We promise that you will never overpay on a high-quality Diamond.

Each diamond is hand-selected with a focus on quality and attention to detail to ensure maximum brilliance. We look through thousands of diamonds to find just a few worthy of our clients– by the time it’s reached you it has already been pre-selected.

Shop our extensive collection of loose diamonds to find the perfect diamond shape. All diamonds we sell are GIA and AGS certified and laser inscribed as well as being verified with our state of the art diamond grading equipment. 

When you buy a diamond from Yarnal Jewelers you will feel confident that you’re buying the best quality for the price. One of our Graduate Gemologists or GIA trained associates will explain the benefits of each stone and help you choose the perfect setting to showcase your diamond.