Chinese culture have believe that the wedding day should be happened in a good day for the good luck of the couple. Do not pick the month of March, July & September because this three months are the month of ghost. No good thing, such as wedding, should happens in those months. And August is a good month for wedding, because the mid autumn festival is a very important event for chinese. It means... 

Diamond ring is a must item for wedding. You might be think the groom would buy the ring for the bride. However, the situation is not that way. Lots of bride in US buy their own wedding ring. A reseach shows, in ten thousand couple there is only 19% groom would buy bride the wedding ring for surprise. And over 30%, bride buy their own wedding ring. Because they think they know better of their taste...