Whataboutism isn't a useful or helpful way to discuss an industry with unbelievable human suffering.
Start a post about copper mining if you want to discuss copper mining. We're talking diamonds here, which have a demonstrable human cost.
I think you're misunderstanding my point. My point was not that there's not human suffering in the diamond industry, nor that it isn't bad. My point is that you, a person that cannot afford expensive natural diamonds (speaking statistically here, I don't know you personally), probably should not cast moral judgments on others that can and do purchase expensive natural diamonds. This is due to the fact that you, a person that can afford a cell phone, chooses to purchase a cell phone, despite that industry experiencing similar levels of human suffering. Therefore, I am forced to believe that in the counterfactual world where you can afford expensive diamonds, you would buy them.
Or, is some level of human suffering ok for you to have the luxury of using an iPhone?