Quality Assurance Every piece of Fine Jewelry is made of either 14k Gold, 18k Gold, or Platinum. The stones that are set in the Gold or Platinum are Diamonds, Genuine Precious and/or Semi Precious Stones (Birthstones). You can rest assure that every piece of Jewelry has been tested by “Tools of the Trade,” listed under Quality Control, so you can feel confident that your purchase is nothing but “The Real Thing.” Quality Control Testers: Diamond Tester : Presidium Multi-Tester with Moissanite feature Precious Metal Tester : Model GT 3000TRI Electronics Precious and Semi Precious Stones Tester , Presidium Gem Tester For : Ruby, Sapphire, Topaz, Peridot, Garnet, Aquamarine, Emerald, Quartz, Amethyst, Citrine, Spinel and Tournamline. Weighing: Scale to Weigh Jewelry : A & D Weighing Scale SV-250 Electronic Precision Balance. Cleaning: Connoisseurs LaSonic II : Sonic Jewelry Cleaner with two cleaning cycles and formulas for regular and delicate cleaning. Jewelry Polishing Cloth : For use on Gold, Platinum, Silver, Copper, and Brass. Gem Cloth : Leaves Gems sparkling clean.