Colored Gemstones

We’re not in Kansas anymore.

When it comes to color, you might say we’re a little over the rainbow. We’re passionate about exotic, vibrant, evocative, sensual colored gemstones of every hue and shade. In fact, we have one of the largest, most spectacular collections of colored gemstones in town.  Colored gemstones are one of our specialties and we love sharing what we know about each and every gem we carry.


The tradition of birthstones is believed to date back to Aaron’s breastplate, which displayed gemstones representing the twelve tribes of Israel. Over time, legends began to boast the healing powers of these gemstones. In any case, a birthstone gift does indeed have one special power: the power to make someone smile!


JANUARY – Garnet

The garnet group of related mineral species offers gems of every hue, including fiery red pyrope, vibrant orange spessartine, and rare intense-green varieties of grossular and andradite.


FEBRUARY – Amethyst

Purple variety of the mineral quartz, often forms large, six-sided crystals. Fine velvety-colored gems come from African and South American mines. In demand for jewelry at all price points.


MARCH – Aquamarine

Blue to slightly greenish-blue variety of the mineral beryl. Crystals are sometimes big enough to cut fashioned gems of more than 100 carats.


APRIL – Diamond

This hardest gem of all is made of just one element: carbon. It’s valued for its colorless nature and purity. Most diamonds are primeval—over a billion years old—and form deep within the earth.


MAY – Emerald

The most valued variety of beryl, emerald was once cherished by Spanish conquistadors, Inca kings, Moguls, and pharaohs. Today, fine gems come from Africa, South America, and Central Asia.


JUNE – Pearl

Produced in the bodies of marine and freshwater mollusks naturally or cultured by people with great care. Lustrous, smooth, subtly colored pearls are jewelry staples, especially as strands.

alexandriteJUNE – Alexandrite

The color-change variety of the mineral chrysoberyl. Bluish-green in daylight, purplish-red under incandescent light, hard and durable. Top quality examples are rare and valuable.


JULY – Ruby

Traces of chromium give this red variety of the mineral corundum its rich color. Long valued by humans of many cultures. In ancient Sanskrit, ruby was called ratnaraj, or “king of precious stones.”


August – Peridot

Yellow-green gem variety of the mineral olivine. Found as nodules in volcanic rock, occasionally as crystals lining veins in mountains of Myanmar and Pakistan, and occasionally inside meteorites.

spinelAugust – Spinel

Just added as a new August birthstone.


SEPTEMBER – Sapphire

Depending on their trace element content, sapphire varieties of the mineral corundum might be blue, yellow, green, orange, pink, purple or even show a six-rayed star if cut as a cabochon.


OCTOBER – Tourmaline

Comes in many colors, including the remarkable intense violet-to-blue gems particular to Paraíba, Brazil, and similar blues from Africa. One of the widest color ranges of any gem.

opal gemstone


Shifting play of kaleidoscopic colors unlike any other gem. Opal’s microscopic arrays of stacked silica spheres diffract light into a blaze of flashing colors. Color range and pattern help determine value.


Colorless topaz treated to blue is a mass-market gem. Fine pink-to-red, purple, or orange gems are one-of-a-kind pieces. Top sources include Ouro Preto, Brazil, and Russia’s Ural Mountains.


November – Citrine

A yellow-to-golden member of the quartz mineral group. Deep golden varieties from Madiera, Spain can resemble costly imperial topaz. Thought by ancient cultures to increase psychic powers.


DECEMBER – Tanzanite

Named for Tanzania, the country where it was discovered in 1967, tanzanite is the blue-to-violet or purple variety of the mineral zoisite. It’s become one of the most popular of colored gemstones.


December – Zircon

Optical properties make it bright and lustrous. Best known for its brilliant blue hues; also comes in warm autumnal yellows and reddish browns, as well as red and green hues.


December – Turquoise

Ancient peoples from Egypt to Mesoamerica and China treasured this vivid blue gem. It’s a rare phosphate of copper that only forms in the earth’s most dry and barren regions.

For more information please visit the AGTA website

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