Same Great Pearls With a Whole New Look With the look of real stone, our purple amethyst "pearls" add some COOL sophistication to your wardrobe. Dressed up or dressed down, they look great with jeans or an evening out. Each pearl is about the size of a quarter. The 16” length will have a choker-like look. The 18” length is our most popular and lies just below the collar bone. The 20” length lies just above the breast line. How They Work With an easy-to-use magnetic clasp, each light-weight patented pearl is filled with non-toxic gel like you’d find in an ice pack. Simply place the necklace in the freezer along with the FREE gel-lined travel pouch for at least 4 hours. Depending on your environment, your pearls will stay cool on you for up to 30 minutes of cooling relief. Perfect for hot flashes, pregnancy, on the golf course, certain medical conditions, and general cooling. If your pearls get dirty, simply wipe them with a soft cloth.