Traditionally, the groom-to-be or the person proposing would be responsible for buying the engagement ring. This is considered a symbol of their commitment to the relationship and their intention to marry.
As for wedding bands, both partners usually buy their own wedding bands, but it can vary depending on the couple’s preferences and financial situation. Sometimes one partner may choose to buy both wedding bands as a gift to their partner, or they may choose to split the cost equally. It’s ultimately up to the couple to decide what works best for them.