I know a whole HOST of women who buy themselves their own jewelry. I would be one of them if I wasn't married and/or didn't have children.
They buy them for any number of reasons...but probably because they saw it, liked it and wanted it. There MIGHT be a significant reason, but unless you ask, then you won't know. Some jewelry for me has significance and I don't wear it very often, for that reason...only on special occasions.
Right hand rings, for the most part are for show...they are for fun....
Most women consider the left hand ring finger sacred and won't wear a ring on it UNLESS there is a reason.
It's probably like buying new shoes or accesorizing in reality.
I love unique pieces.
I KNOW my dear husband takes a stand against buying jewelry because he thinks it's propaganda....the same way Valentines Day is a sham...LOL! It's the same way I take a stand against wearing leather or fur. So since I KNOW I will likely be on my deathbed before he'll even consider buying me another piece of jewelry (w/ the exception of my wedding/engagement ring)...I am saving for some 'real jewelry' to hand down to my own daughter some day.
I find your post highly hilarious and exceedingly ignorant to anything female related. You're likely to find fun and unique pieces. MOST women I know wouldn't wear a diamond bridal ring on their right hand....but then again, there may be some...I don't know. My grandmother has always bought her own jewelry. When she passes on, her daughters...my aunts...will receive some great pieces. She always swore diamonds and ruby's were better than worrying about finding a man! (hahaha...she was married to my gramps forEVER!)
Today's females are FAR more independent and capable of taking care of business....and they take care of their fun and jewelry too.