Some moissanites look slightly yellow or gray when viewed at certain angles. This means the inside of the moissanite may appear blurry. It is also different from diamond visually in that it is doubly refractive, so viewers will see a double image of its back facets. In very large sizes, its display of extreme fire is sometimes called the “disco ball” effect. In large sizes, one carat or above, its intense fire may give it away as a non-diamond gem. Moissanite has more than twice the fire of diamond and slightly more brilliance. It has a hardness of 9.25 on the Moh’s scale, which makes it very hard and durable, although not as hard as diamond. Moissanite tends to have a few more inclusions than CZ, with clarity that could be described as having minor, if any, imperfections. Its value often depends on its degree of colorlessness. ![]() Moissanite can be colorless to near colorless. Synthetic moissanite – Colorless synthetic moissanite became popular as a diamond imitation in the late 1990s and has become a very popular engagement ring stone due to its brilliance, intense fire and durability. These faceted cubic zirconia show bright, broad flashes of fire. Other color CZs make good imitations of darker red, purple, blue, green or black gemstones. Pink and yellow CZs can be used as convincing pink or yellow diamond imitations. CZ has slightly more fire but less brilliance than diamond.Ĭubic zirconia can be produced in almost any color. CZ will, however, yellow in color over time. Most CZ can be described as colorless, and most have high clarity with minute, if any, imperfections. That means it is a hard and durable gem although not as hard as diamond. ![]() The melt is then slowly moved away from its heat source, so that crystals grow at the bottom of the melt until the whole melt has solidified.ĬZ has a Moh’s hardness of 8.5. Introduced in the late 1970s, CZ is made through placing powdered zirconium oxide is inside a metal chamber and heating it to its melting point. Synthetic cubic zirconia (CZ) – Numerous gems have been used as diamond imitations throughout history, but synthetic CZ has surpassed them all in popularity. These simulants, also known as imitations or substitutes, can be natural or manmade. The jewelry industry uses the term “simulant” to refer to materials, such as CZ, that look like another gem and are used as its substitute but have very different chemical composition, crystal structure and optical and physical properties. These colorless and pinkish purple CZ are, from left to right, 44.49 carats, 29.86 carats and 54.60 carats. Applied Jewelry Professional ™ Online DiplomaĬubic zirconia can be produced in large sizes and in different colors.
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