These two pieces of agate are from a deposit in Mexico called Coyamito. New York--Agate and its look are unique. The changes in color mean that every stone is genuinely different from the rest, which gives it a certain appeal in a market where everyone is clamoring for a one-of-a-kind piece.

Agate is actually a form of chalcedony, but what sets it apart from the latter is that it forms in layers and, thereby, its color is varied within. A few exceptions to this are moss agate and dendritic agate, which lack the banding but still are considered agates as they contain more than one color.

Having sharp, cleanly defined bands combined with a strong natural coloring can quickly increase an agate’s value, which also can be influenced by factors such as the pattern, condition and origin. It’s also not uncommon for agates to have fractures, which occur during the mining process and also can greatly affect the final price.

Agate’s origins are as varied as its pricing considerations--there’s landscape agate from Brazil, where the color patterns in the stone actually form something like a landscape scene; dendritic agate from India; various colorful agates from around the United States, especially Oregon, Texas, Montana and Arizona; and the many agate localities in Mexico.

Though supply of agate can come sporadically at times, since many sources are mined artisanally and are worked only during local mining seasons, Bill Heher of Rare Earth Mining Co. said agate deposits also can be extensive, which helps make the stone an affordable, available option for jewelry.

And while very large sizes without banding as well as high quality stones are less available than other types, there still remains a fair amount that is not hard to get one’s hands on these days, said Ratan Poddar of gem supplier Shivam Imports. 

The hot colors
Among the most desirable pieces of agate are those that show their color over the entire surface without any dead spots, according to the International Gem Society’s online reference library.

And the natural, vivid colors are also a hot ticket. Anything in red, pink, green or yellow is highly desirable on the market, said Mark Lasater of gem dealer The Clam Shell, adding that he attributes it to a movement in recent years by consumers toward natural and untreated gemstones. “Customers always want rare, unique and natural stones,” he said. “It’s all a matter of price now.”

In fact, many of the warmer colors, especially when they’re intense, are highly desired by cutters and collectors, and the best specimens and slabs often go into mineral collections rather than get cut, he said.

Shivam Imports’ Poddar added that he’s noticed an uptick in demand for deeper reddish-orange pieces of agate in the past few months, possibly due to the influence of Marsala being Pantone’s color of the year, resulting in a price increase.

And while there’s plenty of dyed agate available in the colored gemstone market, it’s not so prevalent in fine jewelry, except perhaps in smaller sizes like beads or cabochons, Poddar said. 

Most dyed agate comes at a lower cost than the natural material. For example, Lasater said that a gem dealer might charge $5 for a dyed blue Brazilian slab but could expect hundreds for a natural blue slab.

Black tones, however, seem to present a special case. Both men’s and women’s jewelry often are set with dyed black agate because of its similarity to natural onyx so it “will always be a dyed staple,” Rare Earth’s Heher said.

Cameos often can be made from dyed agate as well, which can sell for a fairly high price tag, while dyed tuxedo (black and white) agate, in which the dark part of the stone has taken the dye while the white portion remains natural, offers an interesting and intriguing contrast of colors.

Meanwhile, agate geodes with fine, jewelry-quality quartz crystals are very popular and “have become a staple for designers and goldsmiths worldwide,” Heher said, adding that he believes the trend is far from over and will continue to grow for designers worldwide.

Level playing field
For agate, pricing generally depends on the appearance of the stone, and the sort of inclusions exhibited in it, such as scenes or dendritic trees, also can affect the cost dramatically.

Prices are on the rise right now, and Lasater said he believes there’s one major culprit: the Internet. Just as it has for virtually everything else, the Internet has changed how buyers today are purchasing agate.

In the past most agates, both rough and slabs, were sold at gem shows, where both cutters and collectors would attend and compete for the rare and unique pieces. But since not everyone was able to attend these shows, a segment of buyers were left out of the loop when it came to purchasing agate.

Since the Internet started allowing for auction-style selling and e-commerce of agate, “everyone is on equal footing now, and prices have risen accordingly,” he said.

Rather than a dealer setting a price for agate, these days it goes to the highest bidder. Lasater said this means that good and high quality agates have doubled or tripled in price from what they went for five to 10 years ago.

At the same time, stones from certain older localities, such as Laguna, Coyamito, and Chihuahua in Mexico, as well as Deer Creek fire agate from Arizona, always will garner a higher price if the color and patterns are there. 

“In the coming years, high quality, natural agates with great color will only get more expensive and demand will only increase for this type of material. There are too many people chasing a diminishing resource,” Lasater said.


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