The three principal cancer birthstones are ruby, opal, and pearl. These malignant growth birthstones have special recuperating properties and they benefit Cancerians in various ways. Allow us to examine the purposes of disease birthstones individually, beginning with ruby. Cancerians have many intriguing characteristics since they are represented by the moon and they are a cardinal water sign. You should be truly glad to know that the Disease birthstones are ruby, moonstone, and pearl. A few different gemstones for the Disease zodiac sign are opal, labradorite, and carnelian.