Birth Stone

Information about Sardonyx
Discover some fascinating information about Sardonyx.

  • Facts and Information about Sardonyx
  • Guide to Sardonyx
  • Use of Sardonyx in jewelry

What are Sardonyx?
What exactly are Sardonyx? The definition of a Sardonyx is as follows:

  • Sardonyx is a variant of onyx which contains bands of colors of white, tan, and brown
  • In Sardonyx the colored bands are sard meaning shades of red rather than black, the combination of the two elements giving rise to its name
  • Sardonyx stones usually contain flat-banded, white and brownish-red bands
  • Many semi-precious gemstones are in fact forms of chalcedony including Agate, Onyx, Sardonyx, Carnelian and the Bloodstone. A chalcedony with alternating black and white bands is often used in making cameos. Chalcedony is form of silica which is composed of very fine intergrowths of the minerals quartz and moganite and has a waxy lustre and might be semitransparent or translucent.



  • Sardonyx is defined as a variety of quartz
  • Quartz goes by an array of different names including Jasper, Aventurine, Onyx, Tiger's eye, Amethyst, Citrine, Prasiolite, Rose quartz, Bloodstones, Milk quartz, Smoky quartz and Carnelian

The Colors of Sardonyx
Sardonyx comes in a wide range of natural colors and shades.

Birthstone Facts and Information about Sardonyx
The following list provides Birthstone facts and information about this gemstone:

  • It is an alternate birthstone of the month of August
  • Wedding anniversary gemstone for the 7th and 10th year of marriage
  • Zodiac Sign: Leo
  • Leo dates: July 23 - August 23
  • Leo - The Fifth Sign of the Zodiac: The sign of the Lion
  • Ruling Planet of Leo: The Sun
  • Alternate Birthstones of Leo: Onyx, Diamonds, Carnelians, Peridots and Rubies

History, Significance and Properties of Sardonyx
The gemstone was especially good for engraving upon, having a hard smooth surface capable of taking a high polish, and in ancient cameos the under-stone is generally used to form the ground, the lighter top layer being carved into figures, the different depths of the carving affording variety to the effect. These qualities made it a favourite with the ancient Romans, who believed that the virtue of stones could be increased if suitably engraved. The Sardonyx was therefore frequently carved with a figure representing Mars or Hercules to render its wearer fearless and courageous. The ancients also believed that this stone had the property of preserving its wearers from infectious complaints and the bites of venomous creatures, particularly from the sting of the scorpion. If hung round the neck it would allay pain, give self-control, attract friends, ensure conjugal happiness and success in legal matters.

Sardonyx Jewelry
Sardonyx jewelry is extremely popular especially for those nearest and dearest. At one time this gemstone was valued as more precious than gold or silver. All different types of jewelry containing Sardonyx are available including:

  • Sardonyx rings
  • Sardonyx bracelets
  • Sardonyx pendants
  • Sardonyx earrings
  • Sardonyx necklaces

Sardonyx - Precious - Stone - Guide - Gems - Gemstones - Color - Facts - Information -Info - Jewelry - Jewellery - Birthstone - Colors - Symbolism - Significance- Properties - Jewel - Gem - Gemstone

Birthstones & Jewelry Insurance
Your home insurance policy may not fully cover you for birthstone jewelry insurance, engagement ring insurance or wedding ring insurance. Your home insurance policy probably covers jewelry theft, but not loss that occurs for other reasons. A typical home insurance policy will only usually pay a maximum of $1,000 for jewelry theft. Obtain a Jewelry Insurance quote from the Chubb group of jewelry insurance.


  • Facts and Information
  • Guide to Sardonyx
  • Use of Sardonyx in jewelry
  • Information & Facts about Sardonyx
  • Colors
  • Symbolism and significance



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