John Hardy Sterling Silver & gemstone bamboo ring, size 5.5, preloved

John Hardy Sterling Silver & gemstone bamboo ring, size 5.5, preloved This is a find from a garage sale. I tried to find what type of a ring it is and found the blue topaz ring that I attached pictures of that seems to be the same style. That original price is also understood from the picture I found online. The stone is very dark but it is not black, it is very dark blue. However, I have no idea what stone it is. Definitely not the blue topaz from the reference picture. Maybe polished hematite?