What about listings like these: https://www.amazon.com/White-Arrows-Moissanite-Solitare-Engagement/dp/B07FLTQN8P/ https://www.amazon.com/FANCIME-Solitaire-Brilliance-Moissanite-Engagement/dp/B07XQBYP5Q/

Just wondering what makes the price difference compared to something like what I mentioned from MoissaniteCo.