Serena Pear shaped Ring, Lab Grown Diamond Ring by Kima Serena Ring Waterproof Jewellery Realta Ralta The Serena Ring (Elongated Cushion) Taylor Custom Rings Serena Ring Waterproof Jewellery Realta Ralta. Designed for everyday wear, this ring is crafted to stay with you through it all. Made with high quality base metal and finished with long lasting PVD gold plating, it is waterproof, sweat resistant, and tarnish free with proper care. You can wear it daily in the shower, during workouts, or while travelling without worrying about fading or discolouration.