The Gandik Diraja or Royal Tiara is the head-dress of Her Majesty Seri Paduka Baginda Raja Permaisuri Agong. It is made of platinum and encrusted with diamonds in the traditional 'awan larat' motif. A crescent and a star (Islamic symbols) made of platinum are set in the centre of the tiara. The tiara is worn by Her Majesty on royal ceremonial occasions and during the installation of His Majesty Seri Paduka Baginda Yang di-Pertuan Agong. The tiara is specially designed so that it can be taken apart to form a locket and brooches. From the official Malaysian Monarchy website
The diamond and platinum tiara is made by Garrard.
The Kalung Diraja is the Royal Necklace worn by Her Majesty the Raja Permaisuri Agong. It is made of platinum and studded with diamonds. The necklace is part of Her Majesty's regalia worn during royal ceremonies and during the installation of His Majesty the Yang di-Pertuan Agong. Like the tiara, the necklace can also be taken apart and converted into a pair of earrings, brooches and ear ornaments.
I wish I didnt have to chop up these pics but it would be impossible for me to post close-ups without doing so. The originals are way too big, but I've reduced them in size and posted them too.