Necklaces are available in 17 19 20 inches, knotted with screw clasp for Teen or Adult. Lapis Lazuli aids in stress, anxiety, depression, and ADHD. Amethyst for anxiety & anger * Baltic Amber For adults: anti-inflammation: swelling, back ache, tooth ache, sciatica, hypothyroid, migraine, carpal tunnel, arthritis, and more. * Lapis Lazuli aids in stress, anxiety, and ADHD (February, March, November, December, Birthstones - Zodiac Pisces, Sagittarius) * Amethyst: relieves stress and strain, soothes irritability, balances mood swings, dispels anger, rage, fear and anxiety. Alleviates sadness and grief, and dissolves negativity. (Aries, Sagittarius, Aquarius, Pisces Birthstones: November, December, January, February, March, April) What's great about this teething necklace is it is a mix of 100% Baltic Amber (that's the bead used for inflammation, carpal tunnel, swelling, arthritis, migraines, head aches, back aches, tooth pain, and more) & Genuine Semi-Precious .