This is bad journalism. The article says:

"Pandora also emphasized price as a consideration behind its decision. Lab-made stones cost about a third of mined ones and the switch will make diamond jewelry accessible to more consumers, it said."

In other words, this is a cost-cutting measure that happens to have environmental and ethical benefits: everybody wins. But somehow the headline is "Jeweler Pandora Takes Ethical Stand Against Mined Diamonds".

It can't be both an ethical stand an a convenient way to increase profits.