The stone of choice for love it seems.
The first ring is an Art Nouveau example. From a small window of time between 1895 to 1910, Art Nouveau rings are coveted for their distinction from the Art Deco style. While there are many floral and nature themed Art Nouveau jewelry, the unostentatious pieces are harder to come by and hence command new attention today.
The second ring is an interesting flavor. From the ’40s, there are leftover Deco hues in its Depression working class correctness.