Those celebrating December birthdays are fortunate to have a few birthstones to choose from – zircon, tanzanite, blue topaz and lapis lazuli, among them. But one of the best known and most loved December gems is turquoise, a gem that has been mined and used for thousands of years.

Jewelry found in ancient Egyptian tombs dating to 5500 BCE give turquoise the distinction of being one of the longest-loved gems in history. Many in the U.S. associate turquoise with Native American jewelry, but the gem is also commonly found in China and beloved by designers and collectors around the world.

One of the reasons collectors love this gem is because its appearance can have so much variation. Not all turquoise is turquoise! Turquoise is colored by copper, which creates an array of colors from intense blue to greenish blue to avocado and lime green. The gem’s color can be an evenly distributed medium blue, appear mottled, or display matrix. Matrix is the remnant of the host rock in which the turquoise formed and appears as splotches or veins.

The most prized turquoise color is an even, vibrant blue sometimes called “Persian blue” in the trade, as seen on the right. The stone on the left shows a wonderful example of matrix veins referred to as spiderweb turquoise

Turquoise is most often cut into cabochons, smooth domed shapes that are best suited to show off the stone’s color and any matrix. However, designers also use turquoise in jewelry inlays, as seen in this ring.

This white gold ring by Andrew Sarosi, set with diamonds and turquoise from the Sleeping Beauty mine in Arizona, shows the versatility of turquoise as the backdrop for the diamond detail. Image courtesy of Andrew Sarosi, L.A., Ca.

Turquoise rough is also fashioned into round or oblong beads or tumbled into “nuggets”.

This one-of-a-kind multi-strand necklace of turquoise and gold nuggets, created by Denise James, shows a more unusual use of turquoise in its rough form. Courtesy Denise James.

If you own (or hope to own) turquoise jewelry, there are a few things to keep in mind. Natural turquoise is porous, and its porosity makes it a candidate for treatment to alter its color and improve its durability. The gem can be discolored by chemicals, perfume, cosmetics, and even natural skin oils, so remove turquoise jewelry when cleaning or applying products to your skin.

When needed, clean turquoise with warm, soapy water; never use steam or ultrasonic cleaners. More on the care and cleaning of turquoise can be found on our Gem encyclopedia.

With the right care, fine-quality turquoise is quite durable, and jewelry fashioned from the gem will last generations.

Do you have a December birthday? You actually have a choice of birthstones: do you prefer the unique look of turquoise, the fire of zircon, or the lovely rich-hued tanzanite?

**White gold Sleeping Beauty turquoise earrings in main image courtesy of Andrew Sarosi, L.A., Ca.

The post Turquoise: December’s Birthstone, Loved for its Sky Blue Color appeared first on GIA 4Cs Blog.

Think of every passing year as an opportunity to celebrate with your birthstone. In fact, people have been wearing birthstone jewelry since the 15^th century in Poland, when they were encouraged to own all 12. And while birthstone secrets and lore can be found right here on our blog, today we share what makes YOUR birthstone a powerful statement of your finest qualities.

The post Discover the Powers of Your Birthstone appeared first on GIA 4Cs Blog.

Turquoise, the December birthstone, has a distinct blue or greenish-blue color because it contains copper, and is most commonly found in China and the U.S. southwestern states Arizona, New Mexico, Colorado and Nevada.

Turquoise contains copper, which is the source of its blue or greenish-blue color.

Many minerals, such as variscite, naturally resemble turquoise and other minerals can be dyed to imitate it.

Turquoise necklace with three nymph-like faces in the center medallion. Accents in gold/pink baroque freshwater cultured pearls.

In European tradition, the gift of a turquoise ring means, “forget me not.” Turquoise is the national gem of Tibet, where it is considered to grant health, good fortune and protection from evil. December’s birthstone also imparts peace to those who wear it.

Turquoise “Neptune” carving. Gift of Roben and Vergie Hagobian.

Check out turquoise in the GIA Celebrates Birthstones exhibit at the GIA Carlsbad campus. Schedule a free tour 24 hours in advance by contacting guestservices@gia.edu; calling 800-421-7250, ext. 4116 or 760-603-4116; or visiting www.gia.edu.

The post GIA Celebrates Birthstones – Forget Me Not With Turquoise appeared first on GIA 4Cs Blog.