Engagement is mainly to establish the relationship between the two parties, and to determine the willingness of the two to marry, that is, the process of marriage. So diamond rings are usually bought at the time of engagement. The diamond ring is the most important token in the entire engagement ceremony, so it is very necessary for the prospective couple to buy a diamond ring during the engagement ceremony, most of which are bought by the man to the woman, and also express the importance of the woman and her family.