Rings are sometimes difficult to date. A popular style may be duplicated for decades. It believe yours is a wedding band.
To my eye, the styling of the ring is mid to late Victorian - mostly because of the daisy flower on the side. Victorians were really in to symbolism. The daisy symbolizes purity.
That said, here's an early 20th C ring:
And here is one from the 1980's:
As you can see, both of the "newer" rings still have the daisy motif.