Stylish Sapphire Necklace for Women
This stylish sapphire necklace set has an elegant and modern look. Sapphires belong to the group of minerals called corundum, which is a crystalline form of aluminum oxide. Pure corundum is colorless. However if some aluminum atoms in the crystal structure are displaced by iron and titanium atoms, the corundum acquires a blue color. Greater the concentration of iron atoms in the crystal, stronger is the blue color produced.
Sometimes blue corundum can also contain another impurity called rutile, which imparts a milkiness to the stone known as silk. The rutile fibers can exists as stacks or bundles of fibers. The stacks are arranged in a three-fold pattern, each stack reflecting incoming light to form a single streak of light. Thus the three stacks of rutile, will form three streaks of light intersecting one another at the center, forming a six-rayed star. This phenomenon is known as asterism, which is responsible for the star effect produce by star sapphires.
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