Gemstones are primarily varified on the basis of 4C's that is Color,
cut, clarity and Carat. MOst of the gemstones gets their value. More
richer gemstone is more valuable. another factor would be inclutions
in the stones. In this case it is opposite then diamond, natural
gemstones have more inclusion then the artificial one.
If any one finds more points let me know.
Finally I guess a human can make a fake gemstone with proper inclusion
and shine and all other characteristics that a natural gemstone Caries
Rudd Crux
B2c jewels
www.b2cjewels.com