Trent West is another innovative leader in the wedding band market. TQ Diamonds exclusively carries Trew Tungsten, a designer wedding band line that features tungsten carbide, the hardest metallic substance in the world. This metal is then polished to maintain a gemstone - like luster. Thus, Trent West bands remain permanently polished. The tungsten carbide bands are available in platinum and gold combinations which bring out the unique gray color of the tungsten carbide. Bands are available in widths of 5mm, 7mm or 9mm. For your reference, there are 25 milimeters (mm) in one inch.