Does Jared sell real diamonds?

I'm curious, can you clarify for me if Jared, the jewelry store chain, actually sells authentic diamonds? I've heard conflicting reports and would like to make an informed decision before making a purchase. Are their diamonds certified and of high quality, or should I be cautious about the authenticity of their products? It's important for me to ensure that I'm investing in genuine gemstones, so I'm hoping you can provide me with some insight on this matter.