The zodiac symbol for Cancer is the Crab.
Cancer, the Crab, is the fourth astrological sign in the Zodiac.
The zodiac element for Cancer is Water.
Cancer is ruled by the Moon.
Your astrological, or zodiac, birthsign is Cancer if your birthday is between June 22 and July 23.
In addition, Cancerians also have a number of other gemstones having an affinity with their birth sign - Calcite, Carnelian, Chalcedony, Clear Quartz, Lava Stone, Moonstone, Opal, Pearl, Ruby and Silver.
Click on the above links to read more information about the properties of that particular Cancer gemstone.