The Hoya plant symbolizes love, growth, and endurance. The hoya plant leaves are a resilient beauty and known for their heart-shaped leaves. Hoya plant stud earrings measure 6mm. Available in 925 solid sterling silver or 18k gold vermeil (sterling silver with 18k gold plating). Made with recycled sterling silver. Packaged in our signature bottle. Our goal is to make jewelry that is fun, meaningful, stylish and made of quality materials that will last. All of our earrings, rings, studs, and charms are cast in recycled sterling silver. Our gold is 18k gold vermeil (pronounced ver-may). Vermeil is a process of plating at least 2. 5 microns of gold over solid sterling silver. Our chains are all recycled sterling silver or gold filled and made in the USA. We assemble, package and ship all of our jewelry from our studio in Half Moon Bay, California. To avoid tarnishing, we recommend keeping your jewelry dry. That means avoiding contact with chlorine, soaps, lotions, perfumes, hand sanitizers, cosmetics or cleaning products. We recommend storing your pieces in a soft cloth, protected from other items in your jewelry box or tray to avoid scratching. To clean, simply dip a lint-free, soft cloth in a warm bath of mild soapy water and gently rub. After you have cleaned, simply dry with a lint-free, soft cloth.