This petite stacking ring features pavé set diamonds totalling 0.04 carats. The perfect circle loop shape is 3mm deep and measures 7.5mm in diameter. Stack with other rings from the geometric Naida collection to create your own individual look. Distinctive silhouettes in open diamond loops and gemstones form a minimalist collection with an architectural edge. Stone Diamond is the hardest known mineral to man, formed by the elemental forces of heat and pressure up to 50 miles below the earth, more than three billion years ago. This universally adored precious stone is 140 times harder than sapphire and ruby, which explains why it is symbolic the world over for everlasting love. The' brilliance' and 'fire' within a diamond is caused by its high refractive index - the highest of any naturally occurring gemstone - so the light will bounce and reflect within the stone, which along with its ability to be highly polished, creates the exquisite 'sparkle' effect.