I am currently the Digital Coach for the City of London and the West, within the London and Midlands Region. My role in a nutshell is to coach our leaders on sustainable banking whilst making the lives our of customers easier.
(There is also genuine color-change sapphire which mimics alexandrite, as well as color-change garnet that can be a real fooler.). The first thing to do is check the refractive index of the stone, since each material has unique optical properties.
In brief, a synthetic or lab-created emerald will have the same chemical, physical, and optical properties as a natural emerald. A lab-created emerald is a real emerald but not a natural emerald. However, synthetic emeralds are MUCH less expensive when matched for size and quality against natural emeralds.