Peridot: The Vibrant Gemstone of Summer

Peridot, a breathtaking gemstone known for its distinctive olive green to lime green hues, has captivated jewelry enthusiasts for centuries. Often referred to as the ‘evening emerald’ due to its ability to retain its brilliant color even in low light, peridot offers a unique and accessible option for those seeking a vibrant and durable gem for their fine jewelry.

Definition

Peridot is the gem-quality variety of the mineral olivine. Its chemical formula is (Mg,Fe)2SiO4. The color of peridot is determined by the amount of iron present in its crystal structure. Peridot is one of the few gemstones that occur in only one color: green, though the shade can range from a pale yellowish-green to a deep, intense olive green. It is an idiochromatic gemstone, meaning its color is inherent to the mineral itself rather than caused by trace impurities.

Key Features

• Color: The most striking feature of peridot is its vibrant green color, ranging from yellow-green to olive green. This color is a result of iron content. For jewelry purposes, the most desirable shades are typically bright, yellowish-greens to rich olive greens.
• Clarity: Like most gemstones, peridot is typically included. Eye-clean peridots are rare and command higher prices. Common inclusions include small, dark, needle-like crystals of minerals like chromite.
• Durability: Peridot has a Mohs hardness of 6.5 to 7, making it reasonably durable for everyday wear. However, it is softer than gems like sapphire or diamond and can be prone to scratching or chipping if not cared for properly. Its cleavage is also a factor to consider; it can fracture if subjected to sharp blows.
• Luster: Peridot exhibits a vitreous (glassy) luster, which enhances its attractive green color.
• Refractive Index: Its refractive index of approximately 1.65 to 1.69 contributes to its brilliance and fire.
• Specific Gravity: Around 3.34 to 3.37.

Origin and History

Peridot has a long and storied history, with its origins tracing back thousands of years. The primary source of peridot for centuries has been the volcanic island of Zabargad (St. John’s Island) in the Red Sea, Egypt. Ancient Egyptians mined peridot there and prized it for its beauty, using it in jewelry and talismans. Roman scholars mistakenly identified peridot with emerald, referring to it as 'topazios', believing it was found on the island of Topazios (now Zabargad).

Peridot has also been found in meteors, suggesting it exists in outer space. These extraterrestrial peridots, though exceedingly rare, add a cosmic allure to the gem.

Types / Variations

While peridot is primarily known for its green color, the intensity and shade can vary significantly, leading to different perceived types:

• Yellowish-Green Peridot: Lighter, more vibrant green hues that lean towards yellow.
• Olive Green Peridot: Deeper, richer greens with a noticeable brown or olive undertone.
• Lime Green Peridot: Very bright and vivid greens, often the most sought-after by consumers looking for a pop of color.

The term ‘gem-quality’ is important, as olivine, the mineral from which peridot is derived, is quite common. However, gem-quality peridot suitable for jewelry is found in fewer locations.

How It's Made

Peridot is a natural gemstone formed deep within the Earth's mantle under conditions of high temperature and pressure. It is brought to the surface primarily through volcanic activity. The mineral olivine crystallizes within igneous rocks, particularly basalt. When these rocks are erupted to the surface, the peridot crystals are exposed. Significant deposits are also found in altered peridotite and in alluvial (riverbed) deposits derived from these primary sources. Some peridot has also been found in meteorites.

Grading & Quality Standards

Like other gemstones, peridot quality is assessed based on the standard 4Cs: Color, Clarity, Cut, and Carat Weight. However, for peridot, color is often the most dominant factor.

• Color: The most valuable peridots display a rich, pure green to yellowish-green color, free from excessive brown or yellowish tones. The intensity of the color is also crucial.
• Clarity: Peridot often contains visible inclusions, which are natural characteristics of the gem. Eye-clean stones are more desirable. Common inclusions include lilypad-like formations and small, dark metallic crystals.
• Cut: Peridot is cut in a variety of shapes, including rounds, ovals, pear shapes, and emerald cuts. The cut should enhance the gem’s color and brilliance while minimizing the visibility of inclusions. Faceting is common, but cabochon cuts are also used, especially for lower-quality stones or to showcase specific features.
• Carat Weight: Peridot is available in a wide range of sizes. Larger stones (over 5 carats) with good color and clarity are rarer and thus more valuable.

Buying Guide

When purchasing peridot jewelry, consider the following:

• Color: Look for a vibrant green that appeals to you. Avoid stones with too much yellow or brown.
• Clarity: While some inclusions are expected, try to find stones that appear eye-clean or have inclusions that do not detract significantly from the gem’s beauty.
• Setting: Due to its moderate hardness and tendency to chip, peridot is best suited for protective settings, such as bezel settings or prong settings that cover the girdle of the stone. Avoid tension settings or very exposed prong settings for everyday wear.
• Metal Choice: Peridot pairs beautifully with both yellow gold and white gold, as well as silver. The green hue provides a striking contrast with the metal.
• Source: While peridot is found in many locations, significant sources include Pakistan, Myanmar (Burma), Vietnam, Australia, Brazil, China, Kenya, Mexico, Russia, South Africa, and the United States (Arizona).
• Certifications: While not as common for peridot as for diamonds or high-value colored stones, reputable jewelers can provide information about the origin and quality of the peridot.

Price Range & Value Factors

Peridot is generally considered an affordable gemstone, especially compared to emeralds. Its price is primarily influenced by its color, clarity, size, and cut.

• Color: The most vibrant and pure green shades command the highest prices.
• Clarity: Eye-clean stones are more valuable than those with obvious inclusions.
• Size: Larger peridots with good quality characteristics are rarer and therefore more expensive per carat.
• Cut: Well-executed cuts that maximize brilliance and color saturation will be more valuable.

Prices can range from a few dollars per carat for smaller, less intense stones to upwards of $50-$100+ per carat for exceptional, large stones with superb color and clarity. Larger, high-quality peridots can fetch higher prices, but it remains a gem that offers excellent value for its striking color.

Care and Maintenance

Peridot requires careful handling to maintain its beauty:

• Avoid Harsh Chemicals: Peridot can be damaged by acids and certain chemicals. Do not expose it to household cleaners, perfumes, or cosmetics.
• Cleaning: Clean peridot with warm, soapy water and a soft brush. Rinse thoroughly and dry with a lint-free cloth. Avoid ultrasonic cleaners and steam cleaners, as the sudden temperature changes or vibrations can cause damage.
• Storage: Store peridot jewelry separately from harder gemstones to prevent scratching. A soft pouch or a lined jewelry box is ideal.
• Wear: Be mindful of its moderate hardness. Avoid wearing peridot jewelry during strenuous activities, contact sports, or when doing household chores that might lead to impact or abrasion.

Pros and Cons

Pros:

• Beautiful Color: Offers a unique and vibrant green hue not easily replicated.
• Affordability: Provides excellent value for a gemstone with such striking color.
• Availability: Comes in a wide range of sizes and cuts.
• Symbolism: Associated with positive qualities like strength, protection, and good fortune.

Cons:

• Durability: Softer than many other popular gemstones, making it susceptible to scratches and chips.
• Inclusions: Often found with visible inclusions, which can affect its aesthetic appeal and value.
• Cleavage: Can fracture if subjected to sharp blows.

Famous Examples

While peridot may not have the same level of high-profile, record-breaking auction pieces as diamonds or rubies, its historical significance is notable. Many ancient artifacts and pieces of royal jewelry from various cultures feature peridot. Its presence in historical collections underscores its enduring appeal as a beautiful and meaningful gemstone.

Common Misconceptions

One common misconception is that peridot is a type of emerald. While both are green gemstones, they are entirely different minerals with distinct chemical compositions, hardness, and origins. Another misconception is that all peridot is the same; the range of shades and qualities means there’s a wide spectrum of peridot available.

Related Terms

• Olivine
• Gemstone
• Mineral
• Mohs Hardness Scale
• Vitreous Luster
• Inclusions
• Zabargad Island

FAQs

What is the most valuable color for peridot?

The most valuable peridot colors are intense, pure greens and yellowish-greens, free from excessive brown or olive tones. Brighter, more vibrant shades are generally preferred.

Is peridot a good gemstone for engagement rings?

Peridot can be used for engagement rings, but it requires careful consideration due to its moderate hardness (6.5-7 on the Mohs scale). It is best suited for individuals who are mindful of their jewelry and prefer a protective setting like a bezel to safeguard the stone from potential damage.

How can I tell if peridot is real?

Real peridot is a natural gemstone. Synthetic peridot exists, but it can be difficult to distinguish from natural peridot without specialized equipment. If the price seems too good to be true, or if the color is unnaturally uniform or vivid, it might be synthetic or a different green stone. Purchasing from a reputable jeweler is the best way to ensure authenticity.

What does peridot symbolize?

Peridot is often associated with strength, protection, peace, prosperity, and good fortune. It is also considered the birthstone for August and is linked to the zodiac sign Leo.

Can peridot be worn in water?

It is best to avoid wearing peridot in water, especially saltwater or chlorinated water, as these can potentially affect the gem’s surface over time or damage the metal setting. Always remove peridot jewelry before swimming or showering.