Have you ever wondered why it's custom to propose with a diamond, as opposed to other gems? Curious about carat history? Our guest blogger from the Gemological Institute of America takes us through the fascinating history of the engagement ring from Roman times to the creation of the classic Tiffany mounting in the 19th century. About GIA: GIA created the famous 4c's of diamond value: color, clarity, cut, and carat weight and is considered the world's foremost authority in the grading and identification of diamonds.

Engagement Rings Through the Ages

The engagement ring's romantic traditions resonate throughout time. The Romans first introduced the betrothal ring as a plain, iron hoop. Among the gentry, the iron ring was worn while indoors and replaced with the more valuable gold band when outdoors. As early as the 4th century AD, inscriptions, elaborate or as simple as "honey," embellished the inside of the band. According to Macrobius, a 5th century Roman writer, the betrothal ring was worn on the fourth finger of the left hand. It was believed that from that finger a special vein ran directly to the heart. To this day, the centuries-old custom of wearing an engagement ring in this way has endured.

Engagement Rings Weren't Always About Diamonds

During the Middle Ages, sapphires and rubies initially adorned the engagement ring, while diamonds were incorporated in the 15th century. The earliest written record of the use of a diamond in an engagement ring was in 1477 by a Dr. Moroltinger, who was advising the future Holy Roman Emperor Maximillian to have a ring set with a diamond for his betrothal to Mary of Burgundy. Resisting fire and steel, diamonds stood for the fortitude of a lifelong partnership. Early cutting techniques caused gems to look dull and even black, according to the Gemological Institute of America (GIA), which is considered the world's foremost authority in the grading and identification of diamonds and other gem material. Compensating for these lackluster stones, goldsmiths designed elaborate settings, composed of such romantic notions as rosettes and fleur-de-lis, symbolizing the bride's purity.

More ephemeral than the diamond ring, the rush ring was hastily made from leaves or grass and lasted in many cases as long as the short-lived engagement. A more enduring and popular 16th century ring, the fede (Italian for faith) betrothal ring signified a marriage's immutability in its central image of two clasped hands.

Diamond Discoveries Change the Look of Engagement Rings

With the discovery of diamonds in Brazil in the 18th century, diamond jewelry became more readily available, and diamond cluster engagements rings were in vogue. A common cluster design consisted of small rose-cut diamonds arranged around a larger center stone.

Widespread wealth, initiated by the 19th century's Industrial Revolution and the rich supply of newly discovered African diamond mines, made diamonds available to a greater public. Diamond experts at GIA also note that this period was marked by revolutionary developments in cutting and polishing, resulting in diamonds revealing a brilliance greater than any other gem. The diamond now could stand alone, and thus, the solitaire engagement ring became fashionable.

The simple elegance of the classic Tiffany mounting, introduced in 1886 by Charles L. Tiffany, offered an ideal complement to the beauty of the diamond. With the diamond set high in an open, six-prong mounting, the design permitted greater amounts of light to enter the gem, allowing it to exhibit maximum brilliance. Given all the choices that are available to couples today, not only can they choose an engagement ring that represents a centuries-old symbol of love and tradition, but more importantly, a ring that is a personal expression of themselves.

For more information on diamonds and other gems, and education opportunities in gems and jewelry, visit GIA at www.gia.edu, the GIA Diamond Buying Guide, or call 800-421-7250.