Do you consider yourself knowledgeable about gemstones? Have you ever heard of the “Big Four” gemstones? What do you think makes a gemstone truly precious compared to others? Keep reading to dive deeper into the fascinating world of precious gemstones and uncover the answers to these questions!
What Are the Big Four?
Upon consideration of precious gems or stones, many individuals typically visualize diamonds, emeralds, sapphires, and rubies, collectively recognized within the jewelry industry as ‘The Big Four’. These gemstones have historically been associated with luxury, beauty, and value, resulting in their instant recognition and high desirability.
Beyond the “Big Four,” gemstones such as alexandrite, topaz, opal, and tanzanite are also commonly recognized as precious. What specific attributes differentiate these gemstones and others classified as precious from those considered semi-precious or common rocks?
Common Misconceptions About Precious Gems
It’s common to have misunderstandings about precious gems, especially when it comes to the “Big Four” – diamonds, emeralds, sapphires, and rubies. These misconceptions often stem from a general lack of understanding about how gemstones are formed, valued, and treated.
Rarity
One of the most common misconceptions about diamonds, rubies, sapphires, and emeralds is that they are among the rarest gemstones globally.
All gemstones possess a certain level of rarity, whether it be tanzanite from Africa or rubies from Sri Lanka. The unique combination of pressures, heat, and minerals required to create a gemstone all converge to form a gem or gemstone.
When examining the relative rarity of gemstones, it becomes apparent that numerous varieties are significantly more rare than the so-called “Big Four”: rubies, emeralds, diamonds, and sapphires. For instance, red beryl is substantially more rare than any of the traditionally classified precious gemstones. This illustrates that the idea that the “Big Four” are the rarest is a common misunderstanding.
Value
It’s a common misconception that the “Big Four” gemstones – diamonds, emeralds, sapphires, and rubies – represent the pinnacle of value and cost in the gemstone world. While these stones hold significant cultural and historical importance, it’s important to recognize that a wide array of other gemstones can actually command far higher prices and possess greater overall value, often due to factors such as extreme rarity, unique properties, or exceptional color and clarity.
Factors Affecting the Value of Gemstones
The “Four C’s” are commonly utilized when assessing the value of diamonds, and these characteristics are also applicable to a wide range of other gemstones. The “Four C’s” encompass cut, clarity, carat weight, and color.
Color
Color constitutes a primary determinant in the valuation of gemstones. Specifically, within the sapphire spectrum, a distinct crimson coloration commands a higher market price in comparison to other sapphire chromatic variations. This highly valued red sapphire is recognized as a ruby.
Clarity
Clarity refers to the imperfections or inclusions present within a gemstone, as well as any external flaws that may be visible. Clarity has a significant impact on the value of a gemstone.
In certain gemstone varieties, such as emeralds, discovering a ‘perfect’ natural stone is extremely rare, thereby substantially increasing its value. Conversely, some gemstones, like aquamarine, are commonly ‘eye clean’ and are expected to appear virtually flawless in appearance when of gemstone quality.
Carat Weight
The size of a gemstone exerts a substantial influence on its overall value. Specifically, larger gemstones are frequently less common, and their market prices tend to increase considerably with an increase in size.
Cut
The method employed in cutting a gemstone exerts a significant influence on its final aesthetic. Distinct gemstone types possess unique properties that must be considered during the cutting process. Gemstones that are not expertly cut will be substantially diminished in value.
Treatments
The designation “natural gemstone” pertains to a gemstone originating from the Earth. While a gemstone may be identified as “natural,” it could have undergone human-applied treatments to improve its aesthetic qualities. Such treatments are commonplace for certain gemstones, for example, emeralds, whereas other gemstones are rarely subjected to them.
Rarity and Demand
The value of a gemstone is determined by a combination of rarity and demand. Gemstone size also influences pricing, with larger specimens typically fetching higher values. Conversely, even highly rare gemstones may command lower prices if market demand is insufficient.
Commonly Treated Gemstones
Citrine
Heating transforms purple amethyst into shades of yellow, orange, or gold.
Tanzanite
Heating alters the color, resulting in shades of violet or blue.
Pink Topaz
Heating results in a color transformation to pink.
Ruby
Heating enhances both clarity and color.
Sapphire
Heating enhances both clarity and color.
Diffusion enhances color saturation.
Aquamarine
Heating deepens the color, resulting in a more pronounced blue hue.
Tourmaline
Heating can lighten dark shades.
Apatite
Heating results in the creation of bright, neon-hued colors.
Blue Zircon
Heating can alter the color of colorless zircon.
Kunzite
Heating enhances color.
Morganite
Heating transforms the color from orange to pink.
Emerald
Oiling procedures conceal imperfections and augment coloration.
Filling repairs and conceals fractures.
Lapis
Oiling processes enhance color saturation.
Topaz
Irradiation can induce a blue coloration in topaz.
Tourmaline
Irradiation enhances color intensity.
Diamond
Irradiation enhances color intensity.
Laser treatment can be used to remove inclusions.
Pearls
Bleaching processes result in color lightening.
Ivory
Bleaching processes result in color lightening.
Coral
Bleaching processes result in color lightening.
Turquoise
Stabilization procedures protect and enhance the coloration.
Black Onyx
Dyeing to achieve a black coloration.
So What Is a Precious Gemstone?
From a technical perspective, the concepts of “precious” and “semi-precious” gemstones are not precise.
The American Gem Trade Association (AGTA) has included the following statement in its Code of Ethics: “Members should refrain from using the term ‘semi-precious’ when describing gemstones.” Furthermore, the US Federal Trade Commission periodically considers prohibiting the use of these terms to reduce consumer confusion. The classification of gemstones as “precious” or “semi-precious” is a historically and commercially established categorization rather than a scientifically based one. This distinction can lead to consumer misunderstandings regarding value, rarity, and quality among various gemstones. The AGTA and the US Federal Trade Commission recognize the potential for misrepresentation and aim to safeguard consumers by promoting accurate and consistent terminology within the gemstone industry.