Just be careful with the coloured enamel ones, if you look on Twitter it’s full of people complaining that the enamel goes discoloured or falls out completely. I imagine most of them aren’t looking after them properly, showering or swimming etc, but I see people either get charged a lot to have them fixed, or having to buy a replacement, depending on which SA you speak to. I don’t think the quality is great with the enamel ones and personally would go with the plain silver - I’ve had mine for over ten years plus and it still looks great. Hope you don’t mind me flagging as the blue heart is really cute - just something to bear in mind with it being a gift for a young one