From the Yalkut Me'am Loez on Parshat Chaya Sara (and I would have it in Hebrew except that the Beit Midrash in my dorm has an infuriating way of containing every book except the one I specifically need)
Click on this link for the full-size view (MUCH easier to read.)
Disclaimer: NO, I don't meant to suggest that every Stern girl wants to get married/ is here for a husband/ cares more about the size of her engagement ring than the man she's marrying. However, I have observed the...well, nothing could describe it but avid interest expressed by many in the ring and its size. To be serious for a moment, I have actually heard of girls breaking up engagements because the diamond is too small and this proves the man doesn't really love her- which, if true, is pretty disturbing.
Apparently the Yalkut is quoting the Shevat Mussar 5 (that's where the footnote leads, in any case.)
See? I have a sense of humor. Really.