My grandmother's white gold brilliant ring

After the death of my grandmother in 1979 went this ring to her daughter, my mother. After her death in 1996 I inherited this white gold ring with brilliants. This ring hallmarked 585 which is 14 k White Gold (normal gold hallmark in my country) and I wear it very much. Not only as a reminder of my grandmother and mother but also because simply I like it. In addition, reminds me this ring to the fact that I encountered on my Granny what concerns my love for jewelry because she was also fond of jewels.
I estimate this ring from the 1950s/60s. Do you have any idea of the period? The English name for this kind of rings I don't know (yet). Can you give me that?