Among the most popular gemstones for engagement rings and other fine jewelry, the sapphire is also September's birthstone and the traditional fifth anniversary gift stone. From the Latin "sapphira" for "blue", sapphires in fact span the entire color spectrum, save for one shade: red varieties of the same mineral (corundum) are instead considered to be rubies.
And like rubies, sapphires are among the toughest natural gemstones behind the diamond. Be aware that sharp corners and edges are still vulnerable to chipping, so take care to keep these edges secured, especially when engaged in heavy or outdoor activity. Depending on the type and degree of treatment your sapphire has received, it may be susceptible to wear from harsh chemicals. As with most gemstones, cleaning is best handled with a mild soap/cloth and water, or professionally by your local jeweler.