Fire assay is an age-old technique that has been used for thousands of years for the determination of precious metals content. It provides unmatched accuracy for the determination of gold in any given sample. During the last few decades, X-Ray Fluorescence (XRF) systems have become increasingly popular. These systems are very appealing considering their relatively […] Read More...
Many of United’s customers utilize the stone removal services offered to safely extract stones from finished jewelry sent in for refining. One of the most frequently asked questions is: “Which stones survive the process, and which do not?” Here is a list to answer this frequently asked question: GEMSTONE Heat Resistance Acid Resistance […] Read More...
100% Recycled Gold Sourced from The Pawn Industry
Since 1988, United has been working with pawnbrokers to source scrap gold and silver. Read More...
Your Partner in Precious Metals & Beyond
It’s no wonder we’re the leading supplier of master alloys, de-oxidized sterling silver, solder and precious metal wire products. Read More...