Cancer Birthstone —
Pearl & Ruby.
Quick answer
Cancer (Jun 21 – Jul 22) spans two birthstone months: a Cancer-season birthday falls in June (Pearl) or July (Ruby). Classic zodiac traditions also associate Moonstone with Cancer — traditions vary by source, but the birth-month pairing is exact.
The Cancer stone story
Cancer keeps. Born June 21 to July 22, the crab is the zodiac's memory-keeper — family birthstones and engraved pieces were practically invented for them. Pearl (June) and ruby (July) rule their months: the moon's stone and the heart's.
Jewelry a Cancer would actually wear
Pearl & Ruby pieces — or custom designs where you choose the exact Cancer stone.

18K Gold Vermeil
Moonstone Chain Bracelet

3-Stone necklace
Three-Stone Birthstone Necklace for Mom
✦ Choose 3 birth months + engrave a name on the back

6-Stone bracelet
Family Tree Birthstone Bracelet
✦ Choose 2-6 birth months to represent your family

2-Stone ring
Birthstone Stack Ring Set (2 Rings)
✦ Choose 2 birth months for the two stones
Cancer FAQ
What is the birthstone for Cancer?
Cancer spans Jun 21 – Jul 22, which crosses two birthstone months: June (Pearl) and July (Ruby). So a Cancer baby's birthstone is Pearl or Ruby, depending on exact birthday. Classic astrology also lists Moonstone as Cancer's traditional stone.
What jewelry should I buy a Cancer?
Cancers are known for being nurturing, sentimental, protective — choose jewelry that matches: bold, expressive pieces that make the statement for them. The safest gift is their exact birth-month stone (Pearl or Ruby); the most personal is a ♋ Cancer pendant paired with it.