What must I do to absolve myself of responsibility after I found a bracelet in the sea that I thought was plastic, then I took it and it broke while with me?

A lost item (Luqatah) is money or property that its owner has lost. The ruling concerning it is to safeguard people's property and return it to them. Valuable items, whether found on land or at sea, fall under the ruling of a lost item. As for a trifle that people generally do not care about, such as a date or a piece of bread, it is permissible to take and benefit from it without announcing it. A plastic bracelet is considered a trifle that ordinary people do not bother to seek, and there is no harm in picking it up and benefiting from it.