An Emerald lens would make all the pictures green, ROFLOL!                                                                             
                                                                                                                                                                                                                      
I actually have one magnifying lens that is red. It allows me to look inside rubies, because it is ruby colored. The gemstone itself disappears, due to the lens filtering out the ruby color, and the only thing left is any impurities inside the stone....                                                                                              
                                                                                                                                                                                                                      
It is fun to filter out the stone, as the impurities become visible floating by themselves.                     
                                                                                                                                                                                                                      
**`:)>`**                                                                                                                                                                                                                                                                                                                                                                                                                                                                .