This is a jewellery that is worn by the bride along with the other jewellery. Basically the bride is decked with jewellery from the neck to her waist.
In Tamilnadu you can see a bride may be wearing a choker, a necklace, a haram, a Kaasumaalai on her neck.There are some gaps in between the jewellery worn.
But in Kerala, it starts from the bride's neck to her Ottiyanam, and there are usually no gaps. The arrangement of jewellery is beautiful. And also in TamilNadu they believe a lot in jewellery being heavy. They dont buy light weight jewellery. But in Kerala, you also get light weight jewellery.So, though you see the bride wearing so many, it might be weighing less.
This Haaram can also be worn by youngsters as a single ornament. It goes well with silk sarees, silk salwars suits. Again there are hundreds of patterns from simple to heavy Haarams.