Emeralds, the gemstone variety of green beryl, are well-loved for their unique green colour and are one of the most popular gemstones available today. The vivid green exhibited by emeralds is a result of the presence of chrome and, sometimes, vanadium, in the crystal structure. Colombia, Brazil and Zambia are today the top producers of quality emeralds, but Russia, India, Austria are also significant producers. Despite being a relatively hard gemstone (7.5 – 8), they are relatively fragile stones and are subject to cracking and breaking. When treated with care, emerald engagement rings can last a lifetime.