Chopard Happy Diamond 18k White Gold Rectangular Top 3 Diamond Ring Size 6. This ring is by Chopard from the HAPPY DIAMOND collection, it is crafted from solid 18k white gold in a fine polished finish with a rectangular shape top and a square crystal case with three bezel set floating diamonds inside the case. It is fully signed by the designer with the metal content. Material: Solid 18k white gold. Hallmark: 18k 2123600 Measurements: front: 17mm across x 12mm wide x 6.5mm high from the finger Diamonds: 0.15 total carat weight Color: F Clarity: VS1 Weight: 18.5 grams Stock#: 40988