It has a hardness of 3. Coral is especially fragile. Protect coral from scratches and sharp blows. Do not clean coral in a home ultrasonic cleaner. Coral is often imitated by plastic, glass, porcelain, and stained bone.
Natural coral has a distinctive wood grain texture which can help identify it as the real thing.
Coral is found on the African coasts, Australia, Japan, Mediterranean coasts, Malaysia, and the West Indies. The 340 amazing photographs that capture the essence of underwater life evidence Roger Steene's patience and skill as a photographer. Florida Caribbean Bahamas Including Marine Plants - by Renee Newman Great for scuba divers who want to learn more about coral reefs. An illusory underwater fantasy written for young adults and all adventurous, ocean-loving souls. The definitive book on fascinating, traditional gem lore.