Unique Heart-Shaped 3 Stackable Stainless Steel Ring with Crystals Top Grade Crystal. Stainless steel is resistant to rust, oxidation and discoloration. This corrosion-resistant metal is hypoallergenic too! Free Shipping Offer! Select your ring size and then look below for the "Special Offers and Product Promotions" section. Free Gift Box With Every Order. See more choices. Just Click "Mai Jewelry Shop & Hair Accessories" above.