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Gemstone is an encompassing word used to describe a wide variety of minerals used for beaded breitling replica watches navitimer chronomatic and adornment. Gemstones can be classified as either precious or semi-precious. Gemstone beads are often treated to enhance durability and/or color.Semi Precious Gemstone Beads come in a variety of sizes and shapes. They are usually polished and faceted, donut-shaped, rough-cut or chips. They can be very expensive depending on the stone or the size, and yet chips are ready drilled and inexpensive.There are different qualities of semi precious gemstones and color can vary enormously. Following are some examples of popular gemstones:Turquoise is a semi precious gemstone. Turquoise, which has captivated man imagination for centuries. It color ranges from sky blue to green and is a vibrant light blue stone often seen in southwestern jewelry. It is reasonably priced and ethnically Middle Eastern.Amethyst Beads are made from purple, lilac and mauve quartz. The highest quality is transparent. Amethyst is an affordable purple gemstone. Agate Beads are made from Agate stone. Agate is a distinctly banded variety of Chalcedony, which is a variety of Quartz gemstones composed of layers of quartz, sometimes of different colors.breitling replica watches navitimer chronomatic When it is concentrically banded (often in rather wild patterns) it is called by the subvaritey name ;agate.; When it is in flat layers/bands it is called by the subvariety name ;onyx.; It comes in most colors and there are several types of Agate. Common ones are: blue lace agate, moss agate, tree agate and petrified wood. Malachite Beads are a beautiful green earth color with black bands. Quartz (Rock Crystal) Beads are made from the the most common gem variety of quartz crystal. Like all quartz, it is formed from the two most abundant elements in the earth crust: silicon and oxygen. Quartz is colorless and transparent. It is also known as ;Rock Crystal;. Other colors of quartz have special names such as: Rose Quartz (pink or peach), Citrine (yellow or lemon), and Amethyst (purple or mauve). It is popular for its healing qualities.Opal Beads are usually white, clear, pale red or black, and emit brilliant flashes of multi-colored light. Opal is related to its more commonly found but highly crystalline cousins quartz and agate, and is formed from amorphous ;balls; or lumps; of silica rather that from ordered, naturally faceted crystals breitling replica watches navitimer chronomatic.