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Seems to be a lack of mineralogists here.
Gemstone is a market term. There is no division scientifically between a gem and a mineral.
Minerals form in specific geological settings as a result of temperature, pressure, and the composition of the materials reacting. On the surface of the Earth, we tend to mostly have low temperatures and low pressures. Most minerals are made of only 8 elements, one of which is carbon.
“Gemstone quality” is based on whether or not a mineral can be attractive when faceted. Most minerals do not pass this aesthetic.
To say that a mineral is common or rare is extremely dependent on context. Garnet, for instance, could be the gem that is targeted, or could be waste material that is an annoyance. Most diamond mines throw away massive amounts of garnet.
So, the statement in the title needs a lot of caveats.
Looked up garnet, that's really pretty.