Are Walmart genuine diamonds real?

Could you please clarify for me if the diamonds sold by Walmart are authentic and genuine? I've heard conflicting information about the quality and authenticity of their diamond selection. As a consumer, I want to make sure I'm making an informed purchase and not being misled by any false claims. Could you provide me with some insight into Walmart's diamond sourcing practices and any certifications or guarantees they offer to ensure the authenticity of their diamonds?