Moon Stone

Moonstone is a gem-quality variety of the feldspar mineral group, composed of alternating submicroscopic layers (lamellae) of potassium-rich orthoclase and sodium-rich albite ((Na, K)AlSi₃O₈):

• The Physics of Adularescence: As the molten crystal slowly cools deep within the Earth, orthoclase and albite separate into microscopic stacked lamellar plates. When incident white light penetrates the stone, it scatters and experiences optical interference across these internal layers, creating a billowing, floating silvery-white or electric-blue glow beneath the curved dome—an optical phenomenon gemologists designate as adularescence (or the Schiller effect).
• Ceylon Blue vs. Indian Moonstone: Our inventory features rare Ceylon Blue Moonstone from Sri Lanka (famed for water-clear bodies with floating electric-blue adularescence) alongside classic Indian Moonstone (displaying soft, ethereal silvery-white sheen). Read our Moonstone (Chandramani) Buying Guide for complete gemological grading standards.

While both belong to the broad feldspar mineral family, they are completely distinct gemstone species:

• True Moonstone (Orthoclase): Traditional Moonstone is an orthoclase-albite alkali feldspar crystallizing in the monoclinic system. It characteristically displays a single-color, floating silvery-white or electric-blue adularescent sheen across a translucent or transparent body.
• “Rainbow Moonstone” (Labradorite): Gemologically, gemstones traded as “rainbow moonstone” are actually a variety of plagioclase feldspar called Labradorite. Rather than single-color adularescence, labradorite exhibits multi-colored spectral flashes (blue, green, yellow, and orange) known scientifically as labradorescence.
• The Ratna Gems Guarantee: Every moonstone in our inventory is explicitly identified by its exact mineral species and verified 100% natural, unheated, and Earth-mined by independent gemological laboratory testing.

Every Moonstone (Chandramani) stone sold by Ratna Gems is individually tested and accompanied by an independent accredited gemological laboratory testing report. The certificate identifies the mineral species as Natural Feldspar (Orthoclase / Albite), gemstone variety as Natural Moonstone, exact carat and ratti weight, dimensions, specific gravity (2.56–2.59), refractive index (1.518–1.526), hardness (6.0–6.5 on Mohs scale), confirms the optical adularescence phenomenon, and verifies untreated natural status. Each report includes a unique certificate number and verifiable QR code for direct verification on the issuing laboratory’s official portal.

Optional International Certification: Every gemstone includes an independent accredited laboratory certificate at no charge. If you specifically require an additional report from GII, IIGJ, or IGI, you can select it directly from the certification dropdown on any product page upon request (official laboratory testing fees apply in advance on a non-refundable basis).

With a Mohs hardness of 6.0 to 6.5 and two distinct directions of perfect cleavage intersecting at approximately 90 degrees, Moonstone requires mindful jewelry design and handling:

• Cleavage Sensitivity: Because feldspar crystals naturally cleave along their internal lamellar layers, sharp impacts against hard surfaces can induce internal fractures. Protective bezel or halo settings are strongly recommended for daily rings, while pendants, brooches, and earrings offer naturally protected daily-wear settings.
• Safe Cleaning: Clean gently with lukewarm water, mild dish soap, and a soft microfiber cloth. Dry thoroughly with a lint-free towel.
• What to Avoid: Never use ultrasonic cleaners, steam machines, or harsh domestic acids. Rapid temperature changes and high-frequency vibrational waves can cause the stone to cleave along its internal lamellae. Store your moonstone in an individual padded fabric pouch away from harder gems like sapphires, rubies, and diamonds.

For customers observing classical Indian customs, traditional literature outlines the following customary conventions:

• Customary Metals: Sterling Silver (925 Silver), White Gold, or Panchdhatu alloys are traditionally considered the ideal setting for Moonstone.
• Traditional Placement: Customarily worn on the little finger (Kanishtha) or ring finger (Anamika) of the working hand, or as a pendant close to the chest.
• Traditional Timing: Customary traditions often observe Monday evenings during Shukla Paksha (waxing moon) at sunset or Moonrise.
• Traditional Role (Upratna): Historically cited in Sanskrit texts as Chandrakant Mani, the primary classical substitute (Upratna) for Natural Pearl (Moti), associated with the Moon (Chandra).

Please Note: Ratna Gems shares these details solely for cultural and informational awareness for customers seeking traditional jewelry. We sell all gemstones strictly on the basis of verified physical authenticity, mineral quality, and certified origin, and make no astrological, metaphysical, or medical claims.