Hello, i'm a newbie at this so i apologize if this question is obvious to some of you. The prices listed on this site, are they just for a loose diamond? I've read a mount will increase the price by 100%, as an example, one site has a 5 carat, d color, flawless 5 carat diamond listed at over 50 thousand$ a carat, would a mount increase this diamond by 100??????