Birthstone for June: Pearl.

White/Cream · Purity, integrity, loyalty

Overview & Meaning

June is blessed with an enchanting trio of birthstones: pearl, alexandrite, and moonstone. Pearl, the primary gemstone of June, holds a unique distinction as the only birthstone created entirely by living aquatic creatures. Cultivated in both freshwater mollusks and saltwater oysters, pearls have served as global symbols of purity, wisdom, integrity, and quiet elegance for millennia, celebrated for their luminous, unpolished natural beauty.

Complementing the classic pearl are two of gemology’s most mystical wonders: alexandrite, famous for its dramatic daylight-to-incandescent color shift, and moonstone, celebrated for its billowy, floating adularescence. Together, June’s birthstone trio bridges organic marine wonder with rare optical crystallography, symbolizing emotional harmony, adaptability, and personal transformation.

Mineralogical & Geological Profile

Pearl

Chemical Formula

CaCO3 (Aragonite/Calcite) + Conchiolin (Pearl) / BeAl2O4 (Alexandrite) / (Na,K)AlSi3O8 (Moonstone)

Mineral Species / Class

Organic Gem (Pearl) / Chrysoberyl (Alexandrite) / Feldspar (Moonstone)

Mohs Hardness

2.5 – 4.5 (Pearl) / 8.5 (Alexandrite) / 6.0 – 6.5 (Moonstone)

Crystal System

Organic microcrystalline (Pearl) / Orthorhombic (Alexandrite) / Monoclinic/Triclinic (Moonstone)

Geological Formation & Origin

Pearls form organically when a mollusk secretes concentric layers of aragonite (calcium carbonate) bound by conchiolin protein over an irritant. Alexandrite is a rare chrysoberyl where trace chromium substitutes for aluminum, causing it to transmit green wavelengths under daylight and red under incandescent light. Moonstone consists of alternating sub-microscopic lamellae of orthoclase and albite feldspar that diffract light into an ethereal, floating blue-white glow known as adularescence.

History, Lore & Symbolism

Natural pearls were among the most valuable commodities of antiquity, fished from the Persian Gulf and Gulf of Mannar. In 1893, Kokichi Mikimoto cultivated the first semi-spherical cultured blister pearl in Japan, later perfecting fully spherical cultured round pearls by 1905, revolutionizing the global jewelry industry. Alexandrite was discovered in 1834 in Russia’s Ural Mountains, named in honor of the future Tsar Alexander II on his 16th birthday, and officially added to the June birthstone list in 1952 by the Jewelry Industry Council. Moonstone has been cherished since Roman antiquity as frozen rays of moonlight.

Durability, Care & Cleaning

With a delicate Mohs hardness of 2.5 to 4.5, pearls require gentle handling. Apply perfume, hairspray, and cosmetics before putting on pearl jewelry, and wipe them clean with a damp, soft cloth after wearing. Never use ultrasonic or steam cleaners. Alexandrite is remarkably durable at 8.5 Mohs and safely cleaned in soapy water, while moonstone (6.0–6.5) should be protected from hard surfaces and sudden temperature shocks.

Frequently Asked Questions

Q1 What is the difference between natural and cultured pearls?

Natural pearls form by complete chance in the wild without human intervention, making them exceedingly rare. Cultured pearls begin with a carefully placed bead or mantle tissue nucleus inserted by skilled pearl farmers, after which the oyster deposits natural nacre over several years.

Q2 Why does alexandrite change color?

Alexandrite's chromium impurities create narrow transmission bands for both green and red light. Under daylight (rich in blue-green spectrum), it appears emerald-green; under incandescent light (rich in red spectrum), it shifts to ruby-red.