1 3/8 Inch Diameter White Jade Cabinet or Furniture Knob (Polished Chrome Base) - this cabinet knob is made from white jade and it measures approximately 1 3/8 inches in diameter. The projection is approximately 1 1/8 inches. It features an ornate inlay in the center. The knob comes with a Polished Chrome base and each knob comes with the mounting hardware. Jade is an ornamental rock, mostly known for its yellow, green and colored varieties, which feature prominently in ancient Asian art.