The way to tell if they are real or not is to let me know what (if any) markings you can read on the inner shank of each ring. This type of stone was usually set in sterling silver or 10k gold. You will be looking for the word STERLING, the number 925 if they are silver. The word 10K, 14K, 18K, 375 or 585 is what you would look for if these had any form of gold content.
Then these are all modern low-quality sterling silver rings with the authentic semi-precious stones that you mentioned, with one being made in China. Each ring (no one ring more valuable than the other) has a value of $30-$40.00 each.