This ring is most likely from the Late Victorian era, in particular, the Aesthetic period, due to the fact it is all diamond. Lat in the 1800's is when diamonds became more abundant because of England's reign over South Africa. It was a wedding ring a stand-alone wedding ring. 

It is set with five graduating sizes of a variety of old cut diamonds. The shank is a high karat yellow gold white the stones are set in white gold. The aproximate total weight is 1.70ct.