Zinc Plated perhaps.
It may mean that the ring is made of sterling silver.
It is the silver content in the ring. 988 is 98.8% silver.
What does RGO .925 12k that is imprinted on my ring mean?
What does 14k da mean on silver ring
It mean International Silver company.
What does D mean in a silver ring
What does CI mean on a ring
it tells you about the puarity of silver used to make that ring
It is the authenticity of the diamond contained inside your silver ring.
SP means a ring is silver plated
it a silver ring or gold over silver ring with cubic zar /AKA fake diamond !!!!!!!!!!!