Rich jet black color. Amazingly cool modern designs. Triton Black Tungsten Rings. Using the patented TC.850 formula Triton black tungsten rings and wedding bands are becoming a hot seller. Tungsten is naturally a steely gray color. Tungsten carbides extreme hardness makes for an ideal base metal for a black PVD (physical vapor deposition) application. This specialized process creates a rich black color on the exterior of the ring. Each ring is guaranteed for life.