Sponge Coral Jewelry: Using the Beauty of Nature to Balance Emotions If you are a retailer, then you can purchase Sponge Coral Rings from Rananjay Exports – India’s biggest wholesale gemstone jewelry supplier. Other than sponge coral rings, we deal in a wide variety of gemstone rings that are available in 200+ ethically sourced gemstones. As you explore our inventory of 925 sterling silver jewelry, you will find all kinds of jewelry, from handmade jewelry and casting jewelry to beautiful designer jewelry.