I was always under the impression that a Kallah that receives a diamond ring makes the Bracha Shehechiyanu on it. Igros Moshe, Evan HaEzer 4:84 seems to say that the Kallah should make the Bracha "Hatov V'Hamaitiv". I recently came across this article from Rabbi Kaganoff where he quotes Halichos Shlomo that a Kallah should not recite Shehechiyanu on gifts presented for the engagement or wedding plans. Since this Sefer is not available online I was wondering what the reasons are not to recite the Bracha?
Above, I quoted the shaylah asked by a kallah: Do I recite shehechiyanu when my choson gives me the engagement ring and when my future mother-in-law presents me with my candlesticks?
I mentioned above that some have the custom that one does not recite shehechiyanu on new items other than clothes. Although most poskim disagree with this conclusion, others cite other reasons why one should not recite shehechiyanu on gifts presented as part of the engagements and wedding plans (see Halichos Shelomoh 23:15). Since the matter is disputed, whether a kallah should recite shehechiyanu on her diamond ring or her candlesticks is something that she should ask her Rav.