of giving or exchanging engagement rings is traditionally thought to have begun in 1477 when Maximilian I, Holy Roman Emperor, gave Mary of Burgundy a diamond ring as an engagement present. In other countries like Argentina, men and women each wear a ring similar to wedding bands. They are made of silver ("alianza de plata") when manifesting an informal "boyfriend-girlfriend" relationship, though this first step might not always happen; howbeit depending on finances, this may be the only ring given at all. The gold band ("anillo de compromiso" or "alianza de oro") is given to the bride when the commitment is formal and the [optional] diamond ring ("cintillo") is reserved for the wedding ceremony when the groom gives it to the bride. The gold band that the groom wore during the engagement – or a new one, as some men choose not to wear them during engagement – is then given to the groom by the bride; and the bride receives both the original gold band and the new diamond at the ceremony. The bride's diamond ring is worn on top of the engagement band at the wedding and thereafter, especially at formal occasions or parties; otherwise the engagement band suffices for daily wear for both parties. At the wedding, the rings are swapped from the right to the left hand. In Brazil, they are always made of gold, and there is no tradition for the engagement ring. Both men and women wear the wedding band on their right hand while engaged, and, after they marry, they shift the rings to their left hands. In the modern era, some women's wedding rings are made into two separate pieces. One part is given to her to wear as an engagement ring when she accepts the marriage proposal and the other during the wedding ceremony. When worn together, the two rings look like one piece of jewelry. The engagement ring is not worn during the wedding ceremony, when the wedding ring is put by the groom on the finger of the bride, and sometimes by the bride onto the groom's finger. After the wedding, the engagement ring is put back on, and is usually worn on the outside of the wedding ring. Engagement parties In contemporary American culture some engagements are announced at an engagement party, traditionally hosted by the bride's parents. These parties help introduce both the bride and groom's friends