Uh.. Hey Tnmountains...
You have more different minerals in your back yard than any other place in the country!(North GA, Western NC, Northwest SC)
People that go to "pay to dig" mines looking for sapphire and ruby(or other stones) usually find a stone that the owners are more than happy to cut for you! The problem is, many times the cost of having it cut is more than the stone is worth... and it's very common.
Most sapphire and ruby mines are now "salted", so the tourist come away happy that they have found the "big one".
Back in the 1970's this wasn't the case and the stones you found in Cowee Valley, NC was natural... most found now are salted with corundum from Africa.
Looking for minerals and rocks is a great hobby. When you do this you're called a "Rockhound". Many hunt for many different minerals and some, like myself, only hunt one. I've been hunting corundum for over 30 years. While doing so, I've found many deposits of other type minerals other than corundum. I usually pass on location sites as long as it's not corundum!

Had a friend who liked to hunt Garnet. Told him about a site on Chunky Gal Mountain(NC). Told him to take a big truck with him if he went.. he thought I was joking.. until he made a visit to the site! Me and my "bitter-half" call it the "Garnet Store".
Red stones in this rock are Garnet..
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I have a Geologist friend who lives in NC. For his 50th birthday I gave him a "gift"... a deposit site that I run across a few years earlier. The deposit contained Aquamarine... and you thought it was only in Colorado!?
Corundum is the mineral name for the gem names sapphire and ruby. Sapphire can be any color from clear to black.. but the red sapphire only can be called ruby. The only difference is color.