Birthstone Jewelry February's birthstone is the beautiful amethyst, which promotes love, spiritual wisdom, and intuition. The birthstone for August is peridot, a gemstone that is associated with strength and balance. Peridot is also believed to bring peace, health, and rest – by harmonizing the mind and body. And, finally, December's blue topaz birthstone represents eternal romance and friendship. Blue topaz symbolizes honesty, clarity of feelings, and deep emotional attachment.