Birthstones - Brilliant Jewelers

Sardonyx is the alternate birthstone for the month of August.


Sardonyx stones usually contain flat-banded, white and brownish-red bands. The word Sardonyx is derived from the Greek, sard meaning “reddish brown,” and onyx meaning “veined gem.” The best stones are found in India. They are also found in Germany, Czechoslovakia, Brazil, and Uruguay.

Sardonyx is a variety of the silica mineral called chalcedony. Sardonyx stones usually contain flat-banded, white and brownish-red bands. Carbon is used to create the striking deep black banding in black and white banded sardonyx. The effects are stunning—ancient agate beads in rich colors perfect for blending with solid colored red or black beads.

Sardonyx was originally discovered in an ancient Persian city called Sardis; the region now known as Turkey. The stone has a unique composition, with layers of sard—which comes from the city name Sardis. Sardonyx is a combination of two types of chalcedony (cryptocrystalline quartz): sard and onyx.

Stone Lore

Sardonyx is used as a stone of strength and protection since ancient times; sardonyx is associated with happiness, courage and clear communication. It brings lasting happiness and stability to marriage and partnerships. Sardonyx is a stone of protection and strength. It promotes virtuous conduct and integrity. Sardonyx attracts friends and good fortune and brings lasting happiness and stability to partnerships. It supplements willpower and strengthens characteristics.

Sardonyx increases stamina, vigor and self-control. It alleviates depression and overcomes hesitancy. Sardonyx improves perception. Sardonyx heals lungs and bones, regulates fluids and cell metabolism and strengthens the immune system.

 White Topaz*
 Lapis Lazuli*

* alternative birthstones