Moonstone Gemstone Info
Moonstone image for close comparison
Color: Moonstone typically appears in shades of white, blue, peach, gray, and rainbow. The most sought-after variety is the blue moonstone, which exhibits a striking blue adularescence.
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Origin: Moonstone is found in several regions around the world, with notable sources including Sri Lanka, India, Madagascar, Myanmar, and Brazil. Sri Lankan moonstones are particularly famous for their high-quality blue sheen.
Technical Specifications
| Chemical Composition | KAlSi3O8 (Potassium Aluminum Silicate) |
| Crystal System | Monoclinic |
| Hardness (Mohs) | 6.0 |
| Refractive Index | 1.518 – 1.526 |
| Specific Gravity | 2.56 – 2.59 |
| Optical Properties | Birefringence: 0.008, Pleochroism: Weak, Optical Character: Biaxial |
| Cleavage | Perfect in two directions |
| Fracture | Uneven to conchoidal |
| Luster | Vitreous to pearly |
| Transparency | Transparent to translucent |
| Fluorescence | Weak to none, sometimes blue or white under UV light |
Value and Price Factors
- Color Factors: The most valuable moonstones exhibit a strong blue adularescence against a colorless or white body. Rainbow moonstones, which display a spectrum of colors, are also highly prized.
- Clarity Factors: Moonstones with high clarity and minimal inclusions are more valuable. However, some inclusions, such as tiny fractures, can enhance the stone’s adularescence.
- Cut Factors: Moonstones are typically cut as cabochons to best display their adularescence. The quality of the cut can significantly affect the stone’s value, with well-cut stones showing a more pronounced sheen.
- Carat Weight: Larger moonstones with strong adularescence are rare and command higher prices. However, smaller stones with excellent optical properties can also be valuable.
- Market Price Range: Moonstone prices can range from $10 to $100 per carat, depending on factors such as color, clarity, and size. High-quality blue moonstones can fetch prices upwards of $500 per carat.
Care and Maintenance
- Cleaning: Moonstone should be cleaned using warm, soapy water and a soft cloth. Avoid using ultrasonic or steam cleaners, as the stone’s internal structure can be sensitive to heat and vibrations.
- Storage: Store moonstone separately from other gemstones to prevent scratches. It is best to keep it in a soft pouch or a lined jewelry box.
- Handling: Moonstone is relatively soft compared to other gemstones, so it should be handled with care. Avoid exposing it to harsh chemicals or extreme temperatures, and remove moonstone jewelry before engaging in physical activities.
Popular Usages
- Jewelry Types: Rings, Necklaces, Earrings, Bracelets, Pendants
- Common Cuts: Cabochon, Round, Oval, Pear, Cushion
Buying Guide
- Synthetic Identification: Synthetic moonstones are rare, but imitations made from glass or other materials can be found. Genuine moonstone will display adularescence, while imitations may lack this optical effect.
- Origin Identification: Moonstones from Sri Lanka are known for their high-quality blue sheen, while Indian moonstones often have a warmer, peach or gray hue. Knowing the origin can help in determining the stone’s value.
- Inclusions: Common inclusions in moonstone include tiny fractures or needle-like inclusions, which can enhance the stone’s adularescence. However, large or numerous inclusions can reduce the stone’s value.
- Enhancements and Treatments: Moonstones are generally not treated, but some may be coated to enhance their appearance. Always ask for certification when purchasing high-value moonstones.
More Ways To Compare Moonstone
- What is adularescence in moonstone? Adularescence is the optical phenomenon that gives moonstone its characteristic glow. It occurs when light scatters between the layers of the stone, creating a soft, floating sheen that resembles moonlight.
- Is moonstone suitable for everyday wear? Due to its relatively low hardness (6 on the Mohs scale), moonstone is more prone to scratches and damage than harder gemstones like diamonds or sapphires. It is best suited for occasional wear or in protective settings.
- Can moonstone be used for engagement rings? While moonstone can be used in engagement rings, it is not as durable as traditional stones like diamonds or sapphires. If used, it should be set in a protective setting to minimize damage.
Start With The Material
Moonstone In Plain Gem Terms
Moonstone is a feldspar gemstone known for adularescence, a soft floating glow across the stone.
Short answer for gem lovers
Moonstone should be evaluated by exact identity, natural or treated status, visible appearance, durability, and suitability for the jewelry or collecting purpose. Do not rely on a gemstone name alone; clear disclosure and realistic photos matter more than broad trade language.
What Matters In The Material
- Moonstone listings should clearly state the material or variety being offered.
- Color, transparency, pattern, cut, and polish can affect appearance and value differently depending on the gem type.
- Treatment, dyeing, stabilization, filling, coating, or imitation material should be disclosed when relevant.
- Hardness and toughness affect whether a gemstone is suitable for everyday rings, occasional-wear jewelry, pendants, earrings, or collecting.
- Gems Jewelry may not currently list Moonstone for sale, so treat this as practical education before you compare available natural colored gemstones.
Practical Inspection Notes
- If a listing uses only a romantic trade name, ask for the exact gemstone identity.
- If the price depends on rarity, untreated status, origin, or a special variety name, ask what evidence supports that claim.
- If the gemstone will be used in a ring, check durability and setting protection before choosing it.
- If treatment status is unknown, compare the price as an unknown-treatment stone rather than assuming the most valuable condition.
| Buying factor | Why it matters | What to check |
|---|---|---|
| Identity | Names can be broad, old, or used differently in jewelry trade. | Confirm the gemstone, variety, or gem material. |
| Appearance | Color, pattern, transparency, and cut decide whether the stone looks good in real use. | Review clear photos and video where available. |
| Treatment | Treatment can affect value, care, and person expectations. | Look for plain disclosure such as heated, dyed, filled, stabilized, coated, or unknown. |
| Durability | Some gems are suitable for daily wear; others need protective settings or occasional wear. | Match the gemstone to the intended jewelry type. |
| Value | Price depends on quality, demand, size, documentation, and disclosure. | Compare similar stones instead of judging by name alone. |
What to check before buying Moonstone
- Confirm the exact gemstone identity and variety name.
- Check whether the stone is natural, treated, synthetic, imitation, assembled, or unknown.
- Compare color and face-up appearance in normal lighting where possible.
- Look for visible inclusions, cracks, surface pits, coating, dye concentration, or unstable areas.
- Decide whether the gemstone is durable enough for the intended setting and wear frequency.
- Ask whether a lab report is useful for valuable, rare, or treatment-sensitive stones.