Navajo tufa cast ring w/ Royston turquoise

Navajo handcrafted ring. It features a method called tufa casting to create its unique texture and design. Due to the process, the is very heavy for its size.A beautiful deep green Royston turquoise stone is the focal point of the ring. It has been mounted high in the setting and polished to a gloss finish. If your looking for a one of kind ring made in one the oldest methods of making jewelry then this may be the one. This is one of our finest ring. 

Measurements: 1" in length with a taper of 3/4" to 1/2"

Stone:Royston Turquoise: A district in Nevada consisting of three turquoise mines: Bunker Hill, Oscar Wehrend, and the main producer, The Royal Blue. Royston is known for its beautiful colors ranging from deep green to rich, light blues which are set off by a heavy brown matrix. The Royston mine is producing a little high-grade turquoise today, operated by the Ottison family.

Tufa Cast: The process involves many steps, starting by cutting a stone in half and grinding both halves until smooth on the cut side. The tufa stone is sometimes soaked in water to keep dust down and to make it carved in reverse on one of the smoothed halves. Then a cone shaped channel is carved from one edge of the design to the outer edge of the stone. A corresponding channel is carved on the other half. When the two halves are fitted together, this channel becomes the passageway by which the molten silver is poured into the mold. Superheated air trapped in the mold can ruin a design. To prevent this, vents are carved from the extremities of the design out toward the edge of the stone, allowing the air to escape. The stone mold is heated with a torch until it is carbon smoked on the inside of both halves. This prevents the silver from sticking to the mold. The mold is now ready for casting.

The two pieces of the tufa stone are placed together with the pour channels aligned. Originally the pieces were held together by placing strips of wet leather around the stone. As the leather dried, though, it would shrink slightly and bind the two pieces of stone tightly together. Today, artisans use a number of methods, such as wrapping with wire, plywood board and clamps, or rubber straps.