I understand the difference between a natural gem on one end of the spectrum, and a piece of glass at the other. I realize stones are heated, treated, etc. I also understand that it is possible no to created gemstones in a lab so that, though manipulated by man, they are chemically identical to natural stone.
My problem is, while reading this section, what exact words mean what. Sometimes it sounds contradictory. What is "simulated...lab created, with the chemical properties of a mined stone, or completely mad with different material.
If anyone can just tell e what words go with what definitions, or where to find this, I would really appreciate it, I am stuck.