Abstract: A DYNAMIC PRECIOUS METAL ASSAY DEVICE is described which is based on the methodology of the parent patent DYNAMIC PRECIOUS METAL ASSAY METHOD, U.S. Pat. No. 4,799,999 and achieves a highly accurate gold assay with a range extended to over 24 karats. The specified device requires a manual expulsion of a small amount of electrolyte from a disposable cartridge into a miniature galvanic cell which is formed at the lower tip of the device pencil. Placing the said tip against a gold specimen under test, thereby wetting it, and then by initiating the charging cycle and interpolating algorithm in the external electronics results in a professionally accurate assay of the gold specimen under test. The superior performance of this device is attributed to the novel replaceable electrolytic cartridge and miniature galvanic cell which wets a specimen through a porous interface. This improved device is very stable, rugged and is easily maintained.

Abstract: The invention relates to substitutes of real gems for the purpose of calibrating of commercial diamond testers and for verification of their correct operation. Suggested apparatus consists of a set of objects, which are made of cheap materials like brass, stainless steel, and electrically conductive rubber, and which exhibit combination of thermal and electric conductivities typical for diamonds and their popular imitations like moissanites, cubic zirconia, and others.