Moissanite is a lab-created near-colorless, extremely durable jewel with brilliance and fire that outshines even diamonds. It is a popular alternative to more expensive diamonds. It has a hardness of 9.25, harder than sapphires and emeralds and only topped by diamonds. Unlike diamonds, which are carbon, Moissanites are silicon carbide (SiC), a very rare, naturally occurring mineral found primarily in meteors.
Commercially available moissanites are lab created by only one firm: Charles & Colvard. In 2012 C&C came out with a slightly whiter moissanite the Forever Brilliant moissanite. They are more expensive than the standard moissanites. And in 2015 they came out with a colorless Forever One moissanite.
The Standard Classic Moissanite is comparable to a J-K color diamond, the Forever Brilliant moissanite is comparable to a G-I color diamond and the Forever One missanite looks like a D-F color diamond.
See the difference between a standard and a Forever Brilliant Moissanite in this video.
Comparison between a 7.5mm round Forever Brilliant Moissanite (lower left) vs a Standard Moissanite (upper right). The FB moissanite is really just slightly whiter but not by much.
Selecting the right size of moissanite for your ring:
It is more common to refer to moissanite sizes using actual dimensions in mm instead of using carat weight more commonly used with diamond sales.
Carats are a measure of weight. Two gemstones of the same weight does not necessarily correspond to two stones with the same dimensions. Some sites list moissanites with diamond equivalent weights, some list the actual moissanite weight. I take the carat weights I list from the tables my supplier provides, which are actual moissanite weight.
A diamond and a moissanite of same cut, shape and dimensions will not weight the same. Moissanite's gravity is about 13% lower then diamonds. Moissanites they are typically a bit lighter than a diamond of same size dimension. A diamond's actual dimension can vary widely depending how the stone is cut. Some diamonds are cut shallower, some have more depth. More depth means more weight, but not a bigger diamond if viewed from the top. For instance a 2ct round diamond can measure anywhere between 7.5mm to 8.5mm. Two 2ct diamonds seen next to each other can look very different in size. The faceting and cutting of moissanites is regulated by Charles and Colvard. They are all cut to the ideal dimensions to bring out the maximum sparkle and fire. Commercially available Moissanites don't show the same size variation diamonds can have.
That's why moissanite are better described in mm sizes instead of weight. In my opinion all gemstones should be rather described in actual dimensions and not weight, which can vary too much from stone to stone. After all in the end what you see is the actual dimension of the stone and not the weight of it. A Forever Brilliant moissanite and standard moissanite also have some minor differences in weight since they are slightly different cut. But it's pretty minimal.
Carles and Colvard also used to make some green moissanites. They come in a range of green shades from light green to dark green. However they don't make them anymore and there is only a very limited amount of these stones still available. I just got a few round green moissanites in for my Fold design.
Care for your moissanite:
Moissanite are rated “excellent” for everyday wear. Due to their Moh's hardness of 9.25 they are very scratch resistant but can be scratched by diamonds. Avoid any hard knocks as they can be damaged and chipped. Avoid exposure to heat and contact with chemicals. To clean, gently scrub with a soft toothbrush and a solution of mild dish soap and warm water, rinse well and dry with a lint free cloth. Or clean in an at-home ultrasonic unit. More jewelry care info is available here.
Shop Moissanite wedding and engagement rings here.
See this blog post to compare moissanites to white sapphires and diamonds.
Learn how moissanites are made at Charles & Colvard in their North Carolina head quarters: