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14Kt. Gold 6.82ct. Tourmaline/Emerald Ring - Size 10
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14Kt. Gold 6.82ct. Tourmaline/Emerald Ring - Size 10
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One Time Labor Day Special 14kt. Yellow Gold Magnificent 6.82 carat Watermelon Tourmaline Pear Shaped Ring with 2 Matching Side .95 carats of Emeralds One Emerald-44 ct. & .50 ct. Size 10 Tourmaline 15.7mm in length-11.2mm in width Both side Emeralds - 5mm x 5mm Depth - 5.8mm Entire Ring Size Length - 24 mm Entire Ring Width - 21 mm by J.O. STRAUS This was made by in the early 1980's by Jonathan O. Straus We are designers of Houte Coutre and are not Flea Market Sellers. When we closed our gallery in SoHo in 1990; we decided that EBay would be our primary location. Combined Nemesis II Gallery & FRIMA Jewelry have more than 35 years of hands on experience in fine & costume jewelry design & manufacturing. All of the products we manufacture are made in the U.S.A.... What is Lost Wax Model Making: The origins of the lost wax process are shrouded in antiquity, but it has been used for thousands of years to produce objects in metal which could not be produced any other way, due to the complexity of their form. It permits anything that can be modelled in wax to be faithfully transmuted into metal, and is still used today for certain industrial parts, dental restorations, fine jewelry, and sculpture. While wax patterns were originally modelled by hand, and this can still be done, it is now possible to cast wax into molds as well, so that multiple copies may be made even though the wax pattern is lost in the process. Modern synthetic rubbers have been developed which capture very fine detail and can flex to release undercut areas of a model, greatly reducing the number of mold parts and the number of parting lines necessary, when compared to the earlier technique of using wet plaster molds. Waxes can be cast either solid or hollow, as the wax will coat the inside of a mold after it is filled and poured out. This process is repeated to build up the desired thickness of wax. The process is slightly different for jewelry and sculpture; the smaller quantities involved when making jewelry-sized pieces necessitate some adaptations to overcome the effects of surface tension, such as wax injection instead of simple pouring, and the use of a vacuum table or centrifugal casting machine to force metal into molds. After it is made and touched-up, the wax model is attached to a "pour-cup", which is funnel-shaped to channel the metal into the mold from the outside, using "gates"or "sprues" made from rods of wax , and a venting system is made the same way to convey air and other gasses out of the mold when it is filled with hot metal. Once the model is set up with its gates and vents, it is surrounded with a material that will cover it smoothly when wet and withstand high temperatures when baked. In some places an ancient technique involving cow-dung and clay is still used; a very fine mixture is painted on to capture the detail, then coarser layers are added to build up a mold that can be handled, baked, and poured into. A modern variation on this method is called "ceramic shell"; instead of the cow-dung and clay, a silicaceous slurry is used to cover the model by dipping and/or pouring. Special dry aggregate is then applied to the wet pattern, either by hand or by using a "fluidized bed", which blows the dry particles around in a confined space, covering the wet areas until no more will ad The coated pattern is then left to dry a while and another layer of wet and dry material is applied. This is repeated, using coarser aggregate on the outermost layers, until a sufficient thickness has built up so the mold will hold together through the burn-out and pouring. The other method commonly used is called "investment" casting. The pattern is set up in much the same way as for ceramic shell, except that more venting is necessary due to the decreased porosity of the mold material, which is made using gypsum plaster (plaster of Paris) as a binder for sand, silica flour, or another refractory aggregate. T are many proprietary investment mixtures ... 
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