Purple dress,what colour accesories?
I wouldn’t wear a necklace with that amount of detail you don’t want to overload the dress and make it look tacky. As for accessories I would keep it simple and classic Black heels most likely paten and depending on the style of your dress that’s how I would choose your accessories as I don’t really know by what you have said I would go for gold bracelets and rings also depending on your hairstyle it would affect your earring choice personally keep it simple and classic don’t go overboard and just trust your instincts and if you don’t like something you can always return it.