I have no idea what I'm doing when buying a diamond (haven't had to propose ....yet) not sure I ever will. Sidenote: I bet with Tinder/Bumble/Christian Mingle/etc. on the rise, diamond sales must be at an all time low. I could be wrong, probably am.. whatever.
In any case, if you're thinking about ring shopping any time soon, try to avoid some of the sketch-balls in this video.
P.S. What's all this talk about not being able to take pictures or video of the diamond? Is that normal? Seems a little off to me but then again I can barely tell the difference between a diamond rind and a ring pop.