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Types of Gemstones

Learn about the different types of gemstones and the key factors that influence their color, value, and grading.

What Is a Gemstone?

A gemstone is a natural mineral, rock, or organic material prized for its beauty, rarity, and strength. Often used in fine jewelry, gemstones are valued for their striking colors, distinctive qualities, and meaningful symbolism. Because many gemstones are worn daily, durability is essential. The Mohs scale is used to measure this strength, ranking gemstones from 1 to 10 based on their resistance to scratching.

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Types of Precious Gemstones

Precious gemstones are traditionally regarded as the most sought after and valuable gemstones. They are defined by their beauty, brilliance, and durability. This category includes diamonds, sapphires, emeralds, and rubies, each prized for its unique qualities and lasting appeal.

Diamond
Diamonds are a crystalline form of carbon composed of approximately 99 percent carbon. They are the hardest natural material, ranking a 10 on the Mohs scale. Their high refractive index gives diamonds their exceptional sparkle and brilliance.

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Sapphire
Sapphires are a variety of corundum most commonly known for their blue color, though they are also found in a wide range of other hues. With a hardness of 9 on the Mohs scale, sapphires are highly durable and ideal for everyday wear.

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Emerald
Emeralds are a green variety of beryl, colored by traces of chromium or vanadium. They are commonly included, which is a natural characteristic of the stone. Emeralds have a hardness ranging from 7.5 to 8 on the Mohs scale.

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Ruby
Rubies are the red variety of corundum, with their vibrant color derived from chromium. Ranking a 9 on the Mohs scale, rubies are valued for both their durability and their rich, intense color.

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Types of Semi Precious Gemstones

Semi precious gemstones include a wide variety of stones known for their rich colors, distinctive patterns, and unique optical effects. While generally more affordable than precious gemstones, many semi precious stones are equally captivating and widely used in fine and fashion jewelry.

Rose gold ring with a pink gemstone and diamonds on a light purple background

Alexandrite
Alexandrite is a variety of chrysoberyl celebrated for its rare color changing ability, appearing green in daylight and shifting to red under incandescent light.

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Amethyst
Amethyst is a deep purple variety of quartz valued for its rich color and durability. It ranks a 7 on the Mohs scale.

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Aquamarine
Aquamarine is a blue to blue green variety of beryl known for its clarity and transparency. It has a hardness of 7.5 to 8 on the Mohs scale.

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Garnet
Garnet refers to a group of silicate minerals available in a range of colors, most commonly red. Garnets have a hardness ranging from 6.5 to 7.5.

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Moissanite
Moissanite is a lab grown gemstone composed of silicon carbide, prized for its exceptional brilliance and fire. It ranks a 9.25 on the Mohs scale.

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London blue topaz couples ring set

Morganite
Morganite is a pink to peach variety of beryl colored by manganese. It has a hardness of 7.5 to 8 on the Mohs scale.

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Opal
Opal is a hydrated silica gemstone known for its distinctive play of color. It has a relatively low hardness ranging from 5.5 to 6.5 on the Mohs scale.

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Peridot
Peridot is a green variety of olivine colored by iron. It has a hardness ranging from 6.5 to 7 on the Mohs scale.

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Tanzanite
Tanzanite is a blue to violet variety of zoisite found only in Tanzania. It has a hardness ranging from 6 to 7 on the Mohs scale.

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Topaz
Topaz is a silicate mineral available in many colors and valued for its clarity and brilliance. It ranks an 8 on the Mohs scale.

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Gemstone Color

Color plays a major role in a gemstone’s overall appeal and worth. Influenced by trace elements and crystal structure, each gemstone has its own ideal color range. Stones with richer, more vibrant hues, like deep red rubies and bright blue sapphires, are generally more valuable than paler versions.

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Gemstone Cutting and Polishing

Cutting and polishing transform rough gemstones into refined shapes that enhance their natural beauty. Different cuts, such as round, emerald, and princess, are designed to highlight specific qualities of a gemstone, including its color, clarity, and brilliance.

Gemstone Treatment

Gemstone treatments are processes used to improve a stone’s appearance, often enhancing color or clarity. Common treatments include heat, irradiation, oiling, and dyeing. While many treatments are widely accepted within the industry, others, such as fracture filling or surface coating, must be disclosed due to their potential impact on a gemstone’s value and durability. Brilliant Earth offers only industry accepted treatments, including heat and irradiation.

Gemstone Grading

Gemstones are graded based on key characteristics including color, clarity, cut, and carat weight. Established grading systems, such as those developed by the Gemological Institute of America, provide consistent standards that help buyers evaluate and compare the quality of different gemstones with confidence.

Gemstone Value

A gemstone’s value is influenced by several factors, including rarity, color, clarity, cut, carat weight, and whether the stone is natural or lab grown, treated or untreated. While precious gemstones such as diamonds, rubies, sapphires, and emeralds typically command the highest prices, certain rare semi precious gemstones, including imperial topaz and tanzanite, can also carry significant value.

How to Choose a Gemstone

Selecting the right gemstone is a personal decision that blends beauty, practicality, and budget. Here are the key factors to consider when choosing a gemstone for your jewelry.

Color
Color is one of the most important characteristics of a gemstone and is evaluated through hue, tone, and saturation. Hue describes the primary color, tone refers to how light or dark the color appears, and saturation measures the intensity or richness of the color. Choose a color that speaks to you personally, while noting that evenly distributed, richly saturated colors are typically considered more valuable.

Clarity
Clarity refers to the presence of inclusions or internal characteristics within a gemstone. Some gemstones, such as emeralds, naturally contain inclusions and are prized despite them. Others, like aquamarine, are usually found with higher clarity. Select a clarity level that matches your preferences, remembering that inclusions can sometimes add character and individuality to a stone.

Cut
A gemstone’s cut influences its brilliance, symmetry, and overall appearance. A well cut gemstone reflects light beautifully and enhances both color and sparkle. Choose a cut that complements your jewelry design while showcasing the gemstone’s natural beauty.

Carat Weight and Size
Gemstones are typically measured by their dimensions in millimeters rather than carat weight alone. When selecting size, consider how it fits your style and budget. Larger stones can be more visually striking, but they may also make inclusions more noticeable.

Durability
Durability is determined by a gemstone’s hardness, toughness, and stability. Hardness measures resistance to scratching, toughness refers to resistance to chipping or breaking, and stability reflects how well a stone handles heat, light, and chemicals. For everyday wear, durable stones like diamonds or sapphires are ideal, while softer gemstones such as opals or pearls are better suited for occasional wear.

Personal Style and Budget
Ultimately, the best gemstone is one that fits your personal style and budget. Prices can vary widely based on rarity, quality, and origin. While classic choices like diamonds and sapphires remain popular, semi precious gemstones offer distinctive colors and designs at more accessible price points.

Choosing a gemstone should feel exciting and meaningful. Focus on what you love, balance beauty with practicality, and select a stone that you will enjoy for years to come.