Already known for their commitment to fine jewelry service, selection, and quality, Costello Jewelry Company is thrilled to also offer comprehensive diamond buying services today in their Naperville and Glen Ellyn showrooms. Now accepting stones of all shapes and sizes, the skilled diamond buying staff at Costello Jewelry Company utilize the latest in jewelry technologies to ensure their clients get the most accurate appraisals and up-to-date values.

GIA-CERTIFIED LOOSE DIAMONDS AVAILABLE AT COSTELLO JEWELRY COMPANY

In addition to offering diamond buying services, Costello Jewelry Company is proud to offer an array of gleaming GIA-certified loose diamonds in both their Illinois locations. Featuring round, princess, pear, oval, radiant, cushion, and more popular stone sizes, the loose diamonds on display at Costello Jewelry Company are second-to-none in brilliance, sparkle, and shine.

Hand-picked for quality and condition by a team of GIA graduate gemologists, the diamonds at Costello Jewelry Company make the perfect complement to any piece of bridal jewelry, fashion jewelry, or custom made fine jewelry item. Customers interested in the loose diamond selection available can explore the "Diamond" page of Costello Jewelry Company, or see the collection for themselves in both the Naperville and Glen Ellyn showrooms today!