zirconia

zirconia

cubic zirconia (used as imitation diamond ) because of their incredible brilliance , cubic zircon despite being composed in the laboratory it is considered a full-fledged hard stone, with a high hardness of 8.5 of Mohs scale after the diamond 10 the corundums 9 there are the cubic zirconia in fact the 4° is the Topaz with 8 followed by the Quartz with 7

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