From Ananta’s Colored Stone Specialist
Choosing Colored Stone
Thailand is known as one of the best cities in the world for Colored Gemstones. Although naturally beautiful gemstones are very difficult to find at present, at Ananta, we offer a wide range of gemstones including various rare Rubies, Sapphires, and Emeralds. Our Colored Gemstones are authentic and naturally enhanced with the guarantee that no additives or chemicals have been used. Each Gemstone has its own unique distinctive characteristics that are second to none. Each gemstone is carefully selected and crafted into marvelous adornments. Ananta guarantees that its Gemstones are of the highest quality.
Gemstones come in virtually every color in the spectrum and each gem can come in a variety of hues as well. Prices for gems vary depending on factors such as the gem’s color intensity, rarity, durability and popularity. A gem’s value can be determined by many other factors such as size, clarity, cut, and enhancements.
While there has been no standard set of criteria for judging the color of gemstones, many consider it to be one of the most important characteristics in evaluating gemstones. When describing a gem’s color, the characteristics, which come up most often, are hue, saturation, and tone.
Hue refers to the gemstone’s basic color. A gem is considered more valuable if it’s hue is purer. For example, emeralds should be green, rubies red and sapphires blue.
Saturation measures the intensity of a gem’s color. In essence, a stone that is free of muting tones such as gray or brown are more desirable. Saturation is the characteristic is referred to when a gem is described as dull, strong or vivid.
Tone measures the depth of color and evaluates the color’s lightness or darkness. The terms that jewelers’ use to describe tone range from very light, light, medium light, medium, medium dark, dark or very dark.
Because gemstones form under unique circumstances, each individual gemstone is comprised of a combination of trace minerals, which create a unique set of identifying marks or inclusions. Inclusions will not necessarily detract from the beauty or desirability of a colored gemstone.
When considering a colored gemstone’s clarity, you should measure your expectations against the standard for that variety of gemstone. Some varieties of colored gemstones, such as aquamarine, blue topaz, and citrine, have naturally fewer inclusions while other gemstones, such as emerald and ruby, tend to have a higher rate of acceptable inclusions.
Clarity is an important factor in comparing quality colored gemstones. Even opaque opals can have milky inclusions that will affect their iridescence and color play. In general, gemstones that have moderate inclusions tend to offer the best value. Exceptional gemstones with few or no inclusions are available, but they can command extravagant prices.
While there is no generally accepted grading system to define a gemstone’s cut, colored gemstones will usually have a table, crown, girdle, pavilion, and culet, and its cut refers to the proportions and symmetry of the stone.
The goal for a gemstone’s cut is unlike that of a diamond where the ideal cut maximizes brilliance. For gems, a high quality cut will expose the fewest inclusions and present the most even color.
A well-cut gemstone is symmetrical in all dimensions and reflects light evenly across its surface, providing good brilliance.
A gemstone’s saturation will also help to determine how it should be cut. A gem with a more saturated color can allow for a shallow cut to permit more light to penetrate while a less saturated gem would need a deeper cut to increase its vividness.
The process of enhancing a gemstone to bring out its beauty is a generally accepted practice and is defined as any treatment other than cutting or polishing that improves its appearance, durability or availability. There are many methods of enhancing colored gemstones. We describe the most common forms of enhancements below.
The application of heat to enhance the color and/or clarity of gemstones has been a common practice for centuries. It is part of the standard polishing and finishing process for many colored gemstones. As such, the jewelry industry and the American Gem Trade Association accept this enhancement process. The enhanced color and/or clarity of heat-treated gemstones are permanent.
Fracture filling is the process of filling of a gem with oil or other materials, to improve its appearance. This process began centuries ago by gemstone merchants who found that immersing emeralds in oil or waxes made them look clearer to the unaided eye.