Is this "for themselves" "on their own" or "for the benefit of themselves"? This kind of "for oneself" can be dubious, so it's sometimes confusing.
gip60)..Generally, diamond rings come in very classical styles. This is because men who buy diamond rings as. gifts mostly choose standard styles that reduce the risk of making a wrong choice. Women, however, tend to choose for themselves rings that are more fashionable in design and tend to go for something big and bold...
This is contrasting the way men, when buying rings as gifts, tend to make conservative choices, while women buying rings for their own use tend to be more adventurous. So "for themselves" means "for their own use/benefit", in this case.
not a teacher