Diamond Testing & Supplies
Don't be fooled by fakes!
Professional jewelers and watchmakers need the right equipment for quality work. Let Cas-Ker help you maintain your reputation as a trusted jeweler.
Cas-Ker is your trusted and timely source for precision watchmakers and jewelers tools and supplies, including professional grade diamond testing equipment. Find the diamond and gem testers and graders that help maintain your reputation and safeguard you from imitations. Family owned and operated since 1927, Cas-Ker has the professional grade jeweler and horological products you need to do the work you love.