Sapphire Engagement Rings for Women: A Gem of Royal Romance Sapphire engagement rings for women are a beautiful, romantic, and timeless choice. With its deep blue hue and rich symbolism, sapphire is a gemstone that has been cherished for centuries—and its association with royalty and romance makes it a perfect choice for an engagement ring. Sapphire's signature blue color is caused by trace amounts of iron and titanium within the corundum crystal structure. The most prized sapphires display a deep, velvety blue with excellent clarity. This beautiful color is often described as "royal blue," and it's a color that has been associated with kings, queens, and nobility for centuries. The symbolism of sapphire is deeply romantic. The stone represents wisdom, loyalty, and nobility—qualities that are essential in a lifelong partnership. In ancient Greece and Rome, sapphires were believed to protect their wearers from envy and harm. In the Middle Ages, clergy wore sapphires as symbols of heaven. The iconic sapphire engagement ring worn by Princess Diana and now by Kate Middleton has made sapphire a modern symbol of royal romance. In terms of durability, sapphire is one of the most durable gemstones, scoring 9 on the Mohs scale—second only to diamond. This makes sapphire ideal for an engagement ring that will be worn daily. Sapphire is the September birthstone, making it a meaningful choice for autumn-born women. It also pairs beautifully with diamonds.