Moonstone

A ghostly sheen moves under the surface of this feldspar, like moonlight glowing in water.

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BIRTHSTONES &
ANNIVERSARIES

Moonstone is a birthstone for June, along with pearl and alexandrite.

 

ABOUT MOONSTONE

Moonstone is a variety of the feldspar-group mineral orthoclase. During formation, orthoclase and albite separate into alternating layers. When light falls between these thin layers it is scattered producing the phenomenon called adularescence. Adularescence is the light that appears to billow across a gem. Other feldspar minerals can also show adularescence including labradorite and sanidine.


WHY WE LOVE THIS GEMSTONE

ADULARESCENCE

Moonstone’s unearthly glow is caused by light scattering between microscopic layers of feldspar.

60%

The minerals in the feldspar family make up more than half of the Earth’s rocky crust.

0.5 MICRONS

Feldspar layers that create moonstone’s sheen are similar to the size of a wavelength of light.

RARITY

Rare in top qualities, this etherial gem derives from one of the earth's most common minerals.

ADULARESCENCE

Stacked layers of orthoclase and albite diffract light, creating moonstone’s adularescence.

ANOTHER PHENOMENA

Besides adularescence, moonstone sometimes also shows a cat’s-eye effect.


QUALITY FACTORS

Tourmaline’s varieties have a wide range of quality factors considerations.

CUT As it displays moonstone’s phenomena to best advantage, cabochon is the common cut.

CUT
As it displays moonstone’s phenomena to best advantage, cabochon is the common cut.

COLOR The finest moonstone is a gem of glassy purity with a mobile, electric blue shimmer.

COLOR
The finest moonstone is a gem of glassy purity with a mobile, electric blue shimmer.

CLARITY Characteristic inclusions include tiny tension cracks called centipedes.

CLARITY
Characteristic inclusions include tiny tension cracks called centipedes.

CARAT WEIGHT Moonstone comes in a wide range of sizes and carat weights.

CARAT WEIGHT
Moonstone comes in a wide range of sizes and carat weights.