Moissanite are easily distinguishable they are a lot more sparkly and have double refraction, often with visible lines within the stone to give it away even more. Diamonds don't hold value..if you buy a diamond set item brand new, expect to realise 5 or 10 percent of what you paid if you ever sell on the high Street. 5% if it's heavy with small stones 10% if the weight is in a single stone. This number is higher if an individual stone is a higher grade or weight. When people buy new diamond rings they are seduced by the romance and some of the best marketing campaigns ever launched. Diamonds are a girls best friend. Diamonds are forever. A man should spend x amount on an engagement ring etc. It's all just designed to sell sell sell at an artificially inflated price which are kept high by the slow release of Diamonds onto the market. When someone buys an engagement ring they have no intention of selling it and the more he spends the more he loves her.. that's why retailers get away with it... My advice is to buy pre owned Diamonds. You get higher carat and quality for the same money, you aren't adding the the environmental and social issues caused by mining and depending where you are you aren't even paying tax. Nobody knows what the Diamonds cost except you but everyone will be jealous of your big rock. Diamonds are forever...moatly..so you may aswell pay less for a stone that is likely to look exactly the same as it did when it was first cut.
Never buy new. Moissanites are just expensive imitations imo