There are two kinds of sodium lights: Low Pressure (LPS) and High Pressure (HPS). These lamps are mostly used for street lighting as well as industrial uses. The lamp works by creating an electric arc through vaporized sodium metal.
Enhanced Turquoise. Enhanced Turquoise is a natural stone that has only been treated with either chemicals and heat, or just heat to enhance the color and harden the stone. This type of treatment keeps the color from fading over time and makes more of the harder turquoise available for the market.
The green turquoise cabochon, from an American mine, might become part of a designerâs unique jewelry piece. The even blue color of the cabochon on the right would be called Persian blue in the trade. Excellent-quality turquoise is sought after around the world by designers of unusual jewelry pieces. Typically, whether a fashioned turquoise meets the ideal or departs from it, itâs judged on three basic qualitiesâits color, its texture, and the presence or absence of matrix.