Fossil Ring, Trilobite, 925 Sterling Silver,Trilobite Fossil Ring in 925 Sterling Silver Trilobites were an ancient arthropod living from 240 to 500 million years ago. This is a nice clean example of an ancient life form that was superbly successful, being one of the first arthropods with a hard shell and segmented limbs. For many of us these are fascinating examples of an ancient era in our planets' history. I'm not aware of any esoteric healing properties, save that I do feel a bit empowered