• Water Casting - when melted metal is poured into water to achieve irregular forms. 

  • Wax Agate - a yellow to yellowish-red variety of agate with a waxy luster.

  • Wax Opal - a yellowish-brown common opal with a waxy luster.

  • Waxed Turquoise - a turquoise whose color has been deepened by soaking it in paraffin wax.

  • Wet Diggings - diamond mining associated with alluvial rather than pipe deposits.