16 x 14mm, 20 x 14mm, and 24 x 18mm. You will receive a hand carved set of three opals. Natural in color. The shapes follow the natural beauty of each stone. There may be some dark spots or natural inclusions that add to the beauty of them. Fantastic price for this set. Peruvian Opal is actually formed because of water that gets trapped within quartz. So, it has a natural beauty that is very attractive! Peruvian opal is said to stimulate creativity and helps ideas flow more freely. It also helps us face the future. If you are looking to improve your psychic ability, it will do that too! Have any old wounds? Well, Peruvian Opal is also known to release the trauma of old wounds. And, to top it off, this stone also aids restful sleep.