Tantalum is the newest addition to our contemporary metals and it is highly scratch-resistant and hypoallergenic. Naturally a blue-gray metal, our tantalum is 99% pure. It is important to note that Benchmark only uses conflict-free tantalum processed in non-conflict mines and production facilities. Benchmark Black Titanium is manufactured through a natural process of vapor-deposition involving vacuum chamber technology. The process permits the blackening to penetrate far beyond the ring’s surface giving it more longevity than other similar products.