Hydrothermal Rubies are chemically, physically, and most importantly, optically identical to perfect Rubies mined from the earth. That inner glow you find from natural Rubies is found in these gorgeous specimens too, as you can see. This has to be one of my favorite gemstones that we cut, just for its sheer beauty! And since it's technically a red Sapphire, it's strong enough to endure as a center stone in a ring. No extra worries needed!