I have an Emerald cut diamond ring. I got this ring from an online jewelry shop. The difference which I found visually between a diamond and a moissanite is that a moissanite is more refractive than a diamond. This means that, they are visually more brilliant and will give off more sparkle than a diamond. So Don't worry your wife definitely love your gift.
Thank you so much for your advice
Oh, that looks really amazing but I don't know if PC jewellers are available in the US. But after my research, I came to know that Braverman Jewelry is a company in the US that sells moissanite jewelry. Can you please go to the website and share your choices of necklaces with me, then I will be very grateful to you. I really want to gift my wife something feminine and all I am good at is buying coal for my barbeque!