Be careful w/ buying gemstones &SS, Gold

I'm very familiar with gemstones. Unfortunately, I see alot of gemstones like Aquamarine nwt rings going for as little as 25. Even a "4 carat" that was selling for 59.00. A true 1 carat Aquamarine in Sterling Silver (even used) would be at least 100.00. 4 carats of real, cut Aquamarine would cost 1000's. Same with Emerald & Sapphire. If you buy gemstone jewelry, have it & the metal tested.