If I was going to get a sim, would get a moissanite. Here’s why. Long but bear with me.
Both CZ(diamond nexus is a cubic zirconia, as is asha) and moissanite simulate diamonds. A diamond is a natural one of a kind stone formed billions of years below the earth. Both CZ and moissanite are man made in a lab -both occur naturally in nature but only in tiny minute amounts. Thus they’re replicated artificially in a lab.
CZ, diamond nexus cz, asha cz have a tendency to cloud and scratch over time but has the ability to more accurately mimic a D colorless flawless diamond’s scintillation. Asha CZ are coated to be more resistant to clouding/scratching. Moissanite will not cloud, is very hard like a diamond, but has double refractive properties (diff than a diamond) and is very sparkly and durable. Color wise moissanite cannot mimic a D color diamond as even with the extra amora or forever brilliant treatment -it will only go as high as a near colorless (I or J -I think?)
Moissanite’s marketing has been phenomenal (as was CZ’s back in the day.) What’s not to love about a perfect sparkly cheaper man-made substitute to expensive high quality diamonds?
At this point in time, moissanite is quite a bit more expensive than CZ, as well as diamond nexus cz and asha cz. There is a patent on moissanite in effect until 2015 which limits who can produce it. CZ was pricey initially back in the day too but the price came down as more and more came on the market. It is believed the price of moissanite will substantially drop as well, once the patent expires in 2015 and there is a surfeit of moissanite on the market.
All CZ (asha, diamond nexus included) and moissanite will “pass” as a diamond to the average person especially if they’re in an engagement type setting on one’s left hand and are not so big as to be unbelievable.
The perception here at the Bee of best to worst (the simulant hierachy if you will!) is as follows: Amora moissanite, Forever Brilliant moissanite, moissanite, man made sapphire, Asha CZ, Diamond Nexus CZ, plain CZ . They are priced accordingly.
You can buy a moissanite ring in a gold setting on Shopnbc for $450, Jtv.com has a bunch as well, ebay is loaded with them too. CZ rings are even less.
Hope this was helpful to you. Good luck and congrats on your engagement and law school!