Just read an article in The Telegraph that reports this is becoming "a thing." That women are not waiting for a man but instead treating themselves to nice jewellery. Financial independence and accountability etc.
And why not?
I expressed my wishes to my now husband that I didn't want a traditional engagement ring, just in the same way that I wasn't going to change my title or last name. I certainly didn't want something expensive, or the value of x month's of salary (or whatever it is "supposed" to be). Not for me, personally.
I'm liking the shift here.