ITEM: Sterling Silver Blue Chalcedony & Diamond Pendant.
COMPOSITION: Sterling Silver.
GEM: (1) Chalcedony 30 X 12 mm (1) Round 9 mm (56) brown diamonds = 1.00 carat
CONDITION: Estate Item, excellent
WEIGHT: 8.7 Grams
MEASUREMENT: pendant measures 2" length X 5/8"
COMMENTS: Beautiful blue Chalcedony and Diamond necklace recently purchased from a local estate. Crafted in fine sterling silver, features stunning bluish gray chalcedony with 1.00 carat of diamond accents. Hangs on a beautiful 20" sterling silver beaded chain. Pictures as received from local estate. This beauty is just stunning on, would compliment any outfit completely. Metaphysically, chalcedony provides balance, energy, and friendliness.
Chalcedony is a gemstone species which belongs to the quartz group of minerals. Technically, chalcedony is the gemological term applicable for all varieties of quartz in cryptocrystalline form, which can occur in a wide range of different colors, sizes and patterns. However today, the term, 'chalcedony', is most often used in reference to a very specific type of cryptocrystalline quartz, often referred to as 'actual chalcedony' or 'chalcedony in the narrow sense'. To minimize confusion, other varieties of cryptocrystalline quartz are traded under their own individual trade names, such as 'banded agate', 'carnelian' or 'jasper'. The gemstone 'chalcedony' is distinguished by translucency and its solid, lighter color, typically ranging from bluish to white or gray.
Chalcedony quartz can typically be identified from other minerals through its composition (silicon dioxide), hexagonal crystal structure and superior hardness. Chalcedony cryptocrystalline quartz is a compact to dense form of silica, which means it has extremely fine crystallization. In fact, most cryptocrystalline crystals are so fine that distinct particles cannot even be seen under a microscope. Some cryptocrystalline material may be sub-classified as 'microcrystalline', which refers to cryptocrystalline material with slightly larger crystals (discernable when sliced thinly and observed under a polarizing microscope).
For most of time, chalcedony was thought to be a 'fibrous' variety of cryptocrystalline quartz, but more recently, it was actually discovered to be a combination of quartz and another silicate mineral; moganite (a polymorph of quartz). Both quartz and moganite share the same silicon dioxide chemical composition, but they have varying crystal structures. Moganite is monoclinic, while traditional quartz belongs to the trigonal crystal system. Chalcedony forms with a hexagonal crystal structure.
Chalcedony is also known to possess slight piezoelectricity, similar to that of tourmaline, which means it can carry a small electrical charge. Surprisingly, as common as quartz is, there are actually very few materials that can be easily mistaken for chalcedony. Although distinguishing chalcedony quartz from other minerals is quite easy, identifying individual varieties from within the chalcedony group can be very difficult, as this requires precise observation of color, patterns, impurities and even localities. Another factor which makes identifying chalcedonic varieties even more difficult is that many specimens can fall under multiple trade names.
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