Hematite was very popular in Europe during the Victorian era as an attractive stone for jewelry. In fact, the stone’s shiny luster is so similar to that of polished steel or gold that it was even used for gilding. Now, the stone is still popular in the jewelry world, and these concave double-flare plugs can look quite stunning. The plugs are handcrafted and have a 10mm – 12.5 millimeter wearable area. These grey-black beauties are sold by pairs in many sizes: 8 gauge (3.2mm), 6 gauge (4mm), 4 gauge (5mm), 2 gauge (6mm), 0 gauge (8mm), 00 gauge (10mm), 1/2 inch (12mm), 9/16 inch (14mm), 5/8 inch (16mm), 3/4 inch (19mm), 7/8 inch (22mm), 1 inch (25mm), and 1 & 1/8″ inch (28mm).