Usually synthetics stones looks better and they have no flaw because they are man made. Now, if you buy 1Kg (5000 carats) first quality flame fusion Corundum it will cost you from 200$US for the ordinary color to 2000$US for the rare one, per kilo.Finding a 20 carats natural ruby rough is very difficult and the rough won't even be clean. Same with Emerald, very difficult to find big and clean rough.Then, everything is about offer and demand on the market... Rare stuff = bigger price
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