I'm no expert on gelato but I have yet to find better gelato on the North Shore than the gelato at Bravo Trattoria. This, I think, can be confirmed by the queues at the gelato bar on Friday and Saturday nights, even in the midst of winter!
There's quite a large range of flavours available, with the friendly favourites such as hazelnut, chocolate, and mango being consistently good whilst some of the more unusual flavours like yoghurt and taro changing quite frequently.