It may have but that unfortunately does not repair their past.
It's at least worth noting when a company does take action to repair past bad practices. High-profile brands with many fans on this forum have awful things in their pasts. And current environmental and social practices don't look so hot for products we consume every day.
I was mainly trying to say the ring I know of a person close to me is beautiful. The ethics questions can be easily researched, should OP wish to.