If you can’t spend much, your best bet is this Marni Bracelet. It's a fantastic item, while not very expensive. Also consider this Marni Ring. It's a product you're bound to love which also doesn't cost the earth.
For something in the middle of the price range, consider choosing this Marni Necklace. While the price is very reasonable, this piece is an easy wardrobe update. You might also be interested in this Marni Necklace. It's an attractive option both price and quality-wise.
If you can afford to splurge, then you absolutely must check out this Marni Necklace. This item seems pricey, but it's top quality.