The Alphallumer Necklace - Black Rhodium Plated Diamond Heart by Allumer. The Alphallumer necklace is a fun and contemporary design, perfect for everyday. This necklace features a heart charm, with a diamond studded in the corner. The charm is handcrafted out of black rhodium. It comes on a colourful ball chain of your choice. About The Designer: Allumer is a London-based, award-winning jewellery brand. Natasha Leith-Smith, it’s founder and lead designer, draws inspiration from friendship, love, and light. Allumer means ‘to light up’ in French, and with their bright and colourful collections, they’ll bring light and sparkle into your life. To find out more about the designer please visit Allumer.