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Sapphire is the birthstone for September, the month when the most babies are born. Ancient lists also name sapphire as a birthstone for April and the gemstone for the sign of Taurus.

Sapphire has long symbolized truth, sincerity, and faithfulness. Tradition holds that Moses was given the ten commandments on tablets of sapphire, making it the most sacred gemstone. Because sapphires represent divine favor, they were the gemstone of choice for kings and high priests. The British Crown Jewels are full of large blue sapphires, the symbol of pure and wise rulers.

Since sapphire symbolizes sincerity and faithfulness, it is an excellent choice for an engagement ring. When Prince Charles chose a sapphire engagement ring for Princess Diana, couples all over the world were inspired to revive this venerable tradition.

The most valuable sapphires have a medium intense, vivid blue color. The best sapphires hold the brightness of their color under all different types of lighting. Any black, gray, or green overtones mixed in with the blue will reduce a stone's value. In general, a more pastel blue would be less preferred than a vivid blue but would be priced higher than an over dark blackish blue color. As with all gemstones, sapphires which are "clean" and have few visible inclusions or tiny flaws are the most valuable. However some very fine sapphires, in particular those from Kashmir, have a velvety mist-like texture which enhances the richness of the blue

Sapphires come from Sri Lanka, Thailand, Australia, and Cambodia. Nigeria, Kenya, Tanzania, China, Vietnam, Madagascar, and the United States also produce some sapphire. The most famous sources for sapphire are Kashmir and Burma, which is now known as Myanmar. Kashmir sapphire, which was discovered in 1881 when a landslide in the Himalayas uncovered beautiful blue pebbles, has a rich velvety color prized by connoisseurs. Burma sapphires, from the same region that produces fabulous rubies, are also very fine. However, today, these two sources account only for a very small quantity of the sapphire on the market.

Most fine sapphire on the market today comes from Sri Lanka, which produces a wide range of beautiful blues from delicate sky blue colors to rich saturated hues. Kanchanaburi in Thailand and Pailin in Cambodia are renowned for deep blue, even colors. Two relatively new mining localities are showing promise: Madagascar, which has produced some exceptionally fine stones in small sizes but has no organized mining yet, and Tanzania, which has long produced sapphire in other colors but is starting to produce blue colors as well from a new deposit in the south.

Sapphire is perhaps the toughest and most durable gemstone available on the market. With a hardness of 9 on the Mohs scale, sapphire is harder than any other gem but diamond and it has no cleavage plane so it cannot be cut with a single blow like a diamond. In fact, synthetic sapphire is used for scratch-resistant watch crystals, optical scanners, and other instruments because its durability can be trusted. That durability ensures that sapphire jewelry will be treasured for generations.