Gemstones

Colored gemstones come in every hue, tone and saturation. They are  born of nature and evolve into something exquisite and the beauty of colored gemstones is everlasting. Gathered from all corners of the world, every colored  gemstone is a unique creation that brings with it a rich history that blends  the mystery of nature with the skill of man.

List of Birthstones


Garnet January Birthstone 2nd Anniversary

Garnet

January Birthstone

2nd Anniversary

Amethyst February Birthstone 6th Anniversary

Amethyst

February Birthstone

6th Anniversary

Aquamarine March Birthday 19th Anniversary

Aquamarine

March Birthday

19th Anniversary

Diamond April Birthstone 10th Anniversary

Diamond

April Birthstone

10th Anniversary

Emerald May Birthstone 20th Anniversary

Emerald

May Birthstone

20th Anniversary

Alexandrite June Birthday 55th Anniversary

Alexandrite

June Birthday

55th Anniversary

Ruby July Birthstone 15th Anniversary

Ruby

July Birthstone

15th Anniversary

Peridot August Birthstone 16th Anniversary

Peridot

August Birthstone

16th Anniversary

Sapphire September Birthstone 5th Anniversary

Sapphire

September Birthstone

5th Anniversary

Opal October Birthstone 14th Anniversary

Opal

October Birthstone

14th Anniversary

Citrine November Birthstone 13th Anniversary

Citrine

November Birthstone

13th Anniversary

Tanzanite December Birthstone 24th Anniversary

Tanzanite

December Birthstone

24th Anniversary

Pearl June Birthstone 3rd Anniversary

Pearl

June Birthstone

3rd Anniversary

Moonstone June Birthstone

Moonstone

June Birthstone

Tourmaline October Birthstone 8th Anniversary

Tourmaline

October Birthstone

8th Anniversary

Topaz November Birthstone 4th Anniversary

Topaz

November Birthstone

4th Anniversary

Zircon December Birthstone

Zircon

December Birthstone

Turquoise December Birthstone

Turquoise

December Birthstone

Druzy

Druzy

Kunzite

Kunzite


The 4C's of Gems

Courtesy of AGTA

It’s reasonable to expect lasting value and enjoyment when you purchase gemstone jewelry. Learning a few things about gemstone quality and value will help you make sure you get what you want – and deserve.

You can start by trusting your instincts. Sensory appeal is always paramount. So, if a particular gemstone or jewelry design "speaks" to you, by all means listen!

You can also use what you know about the 4Cs. The familiar diamond value factors of color, cut, clarity, and carat weight apply to colored gemstones as well. However, each gemstone variety is judged by its own potential: no one expects an aquamarine to have the same color as a sapphire or an emerald to be as flawless as an aquamarine. But there are a few general rules you can use to judge gemstone quality.

Besides reflecting the natural rarity of larger gemstones, per-carat price can serve as an indication of other value factors. If two gemstones of the same kind and weight have significantly different per-carat prices, there will be differences in color, cut, or clarity, which you need to consider in a purchase decision.

For detailed gemstone information click here to download the AGTA Gemstone Information Manual.
Color

Some gemstones come in a multitude of colors, while others have more restricted palettes. Experts analyze all these chromatic options in terms of three essential components: hue, tone, and saturation. Hue is the basic color sensation – blue, red, green, and so forth, plus blends like purplish red and violet-blue. Tone is a color’s lightness or darkness, and saturation is its visual intensity.

Colors of pure hue, medium tone, and high saturation are generally most valuable, but different kinds of gems have differing potentials in this regard. For example, sapphire and tanzanite can reach a deeper blue than aquamarine, topaz, or zircon. Color ranges can overlap to some extent, so different gemstones may have the same color. Each is valued according to its own unique possibilities, however. Thus, the particular tint that's considered "best" for one gemstone might be "medium" for another.

In buying decisions you need to be aware of color ranges and objective value assessments, but it’s best to rely on your eyes and heart. Pure or mixed, light or dark, vivid or muted – whichever color holds the most appeal for you is the one to choose.

Cut

Choices in cut are almost as varied as for color – and they're every bit as intriguing. Transparent colored gemstones are most often faceted like diamonds, in dozens of geometric shapes and styles. The ancient domed form known as the cabochon is traditional for gemstones like jade, opal and turquoise. It helps to bring out the special optical effects seen in star gems and cat’s-eyes, too. Today many kinds of gemstones are fashioned into carvings. These range from classic cameos and natural motifs to designs that push the edge of abstract expression.

Whatever the technique may be, cut is chiefly responsible for revealing a gemstone's beauty. Its contribution to appeal and value arises from the cutter’s artistic creativity, technical skill and patient labor.

To judge the quality of cut, examine the gemstone as you hold it at arm's length and rock it gently back and forth. The overall form ought to be pleasing and dynamically balanced. Color and light should dance throughout a faceted gemstone, with no washed out "window" in the center or dead spots around the edges. When you look close-up, details like facet shape need to be precise, with polished surfaces appearing smooth and bright.

Clarity

Most kinds of colored gemstones may have internal characteristics – or inclusions – that it's possible to see without magnification. Many of these are simply byproducts of the natural processes that create gemstones within the Earth. Among the most common are tiny mineral crystals that became caught up in larger gemstone crystals as they grew. As long as such inclusions aren't prominent, they don’t diminish a colored gemstone’s beauty or desirability, and have little effect on its value.

There are some exceptions to this rule, however. You can expect a few gemstones to be "eye clean," with only microscopic clarity features. This list includes aquamarine, citrine, tanzanite, and topaz. On the other hand, inclusions in emerald and red tourmaline may be fairly obvious, but won't have a major impact unless they’re also unsightly.

It's important to recognize that inclusions have a positive side, too. They can prove that the gemstones in which they occur are natural – not synthetic or imitation.  Scientists study inclusions to learn the secrets of how gemstones form, and when viewed under a microscope, some are strikingly beautiful in their own right.

Carat Weight

Like diamonds, most colored gemstones are weighed and priced by the carat. (One carat equals 1/5 gram.) As with color, however, different kinds of gemstones have differing weight potentials.  A few rarely exceed 5 carats in high quality. Many are readily available up to 15 or 20 carats and some can be even larger.

For gemstones with limited weight ranges, per-carat prices usually climb steeply as the carat weight goes up. For those with wider ranges, any increases tend to be more gradual. A 3-carat ruby might have a per-carat price that’s three times higher than a 1-carat ruby of the same quality. As a result, the larger gemstone would cost nine times more than the smaller one. In contrast, a 5-carat amethyst is likely to have about the same per-carat price as a 1-carat amethyst, so it will cost only five times as much.

Besides reflecting the natural rarity of larger gemstones, per-carat price can serve as an indication of other value factors. If two gemstones of the same kind and weight have significantly different per-carat prices, there will be differences in color, cut, or clarity, which you need to consider in a purchase decision.