Earlier quoted context omitted.
You heard a different question to the one the women heard. You heard "Do you want this man-made item that is functionally identical to a naturally occurring item". The women heard "Do you want the jewelry that symbolises your love to be real or fake?" Functionally, there is almost no difference in an item containing a diamond and an identical one containing worthless rock. But, you know, jewelry derives almost all of…
> Jewelry that is neither expensive nor rare stops being jewelry. Costume jewelry is usually neither expensive nor rare, and yet it remains popular with certain demographics.
An engagement ring is emphatically not costume jewelry, and if you don't understand that "real jewelry" is an important sense the antonym of "costume jewelry", well, now you do.