Here is a general guide to chain lengths, for when you want to buy a necklace online, whether to yourself or as a gift. How long you want your chain to be is of course a personal choice, but it usually depends on the type of neckline the top you wear tend to have, so when buying a necklace as a gift you can use the same criteria. Does the person usually wear a round, turtle,boat or V-neck? Or does he/she mainly wear shirts? If so, is it worn buttoned up or unbuttoned?