The 18kt White Gold Back to Black 3-Ring Combination by Verifine London. The Back to Black Combination by Verifine London. A white diamond eternity ring in 18kt white gold, sandwiched between 2 sparkling black diamond eternity rings in 18kt white gold, to make up this very cool stack in black and white. This unique handcrafted piece of designer jewellery harmonises with every occasion and outfit. About The Designer: When husband and wife team Neil and Wendy Duckworth established Verifine they had a clear objective in mind: to craft gorgeous, skinny eternity rings that sparkled enough to stand alone, yet could be easily stacked. From there, this London business has grown to include earrings, bracelets and necklaces as well as their iconic slender bands set with luminous precious stones. To find out more about the designer, please visit Verifine London.