June Birthstones: A Celebration of Pearls, Moonstone & Alexandrite

June claims three birthstones, each more fascinating than the last. Pearls are the only gems created by living organisms. Moonstone captures light in ways physics can barely explain. And alexandrite changes color like magic — green in daylight, red under incandescent light.

Pearl: The Living Gem

Pearls are biogenic gems — produced by mollusks as a defense mechanism against irritants. When a foreign particle enters an oyster or mussel, the animal coats it in nacre (mother-of-pearl): alternating layers of aragonite crystals and conchiolin protein, each layer approximately 0.5 micrometers thick. It's this microscopic layering that produces a pearl's characteristic luster and orient (the iridescent rainbow shimmer across its surface).

Natural pearls (formed without human intervention) are extraordinarily rare and can command prices exceeding $100,000 for fine specimens. Most pearls today are cultured — started by a human technician inserting a bead nucleus into the mollusk. Quality cultured pearls require 2-5 years of growth, during which the mollusk coats the nucleus with thousands of nacre layers.

Types: Akoya (classic white, from Japan), South Sea (large, from Australia/Philippines), Tahitian (naturally dark, from French Polynesia), freshwater (most affordable, from China).

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Moonstone: Captured Light

Moonstone is a variety of feldspar that displays adularescence — a billowing, blue-white glow that appears to float inside the stone as you turn it. This optical phenomenon occurs because moonstone contains alternating layers of orthoclase and albite feldspar, which scatter light between them.

The finest moonstones show strong blue adularescence against a transparent or semi-transparent body. Sri Lanka produces the most prized specimens, with India contributing the rainbow variety that shows additional flashes of orange, green, and pink.

Why collectors love moonstone: It's one of the few minerals that genuinely seems alive. The light inside moonstone shifts constantly as you move it — like watching clouds pass across an internal sky.

Alexandrite: Nature's Color-Change Magic

Alexandrite is a variety of chrysoberyl that contains chromium — the same element that colors emerald green and ruby red. The chromium in alexandrite sits at a precise concentration that absorbs the yellow component of white light, transmitting both the red and green wavelengths. Under daylight (which is blue-rich), the green wavelengths dominate. Under incandescent light (which is red-rich), the red wavelengths take over.

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First discovered in 1830 in Russia's Ural Mountains, alexandrite was named for Czar Alexander II. Russian alexandrite from the original deposit is the most valuable, showing dramatic green-to-red color change. Modern sources include Brazil, Sri Lanka, and East Africa, though none match the original Russian material for intensity of change.

Fine alexandrite is among the rarest and most expensive gemstones on earth. Stones over 3 carats with strong color change can exceed $50,000 per carat — rivaling the finest rubies and emeralds.

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Collecting June Birthstones

Of the three, moonstone is the most accessible for crystal collectors. Raw moonstone specimens, polished spheres, and palm stones offer the adularescent experience at accessible prices. Display moonstone where shifting natural light can interact with it throughout the day — a windowsill or glass shelf works beautifully.

Pearls are best experienced as jewelry. And alexandrite, while extraordinary, is primarily a faceted gemstone — rough crystal specimens are extremely rare and museum-tier.

Shop moonstone and other June birthday crystals in our full collection. Free shipping on orders over $150.