A thermal growing  system creates crystals that are then fashioned into Moissanite gems. Although these crystals rival any earthly gem in fire and brilliance, I am stymied as to why something lab-grown  is so expensive.
 
Gemstone:  Lab Grown Moissanite
Size:            17 X 13 mm      3.5 carats
Pendant size: 1-1/2  X  1 inch
Wire:               Fine Silver