Elevate Your Confidence with Red Coral Rings: The Ultimate Accessory for the Modern Woman Red coral is a type of organic material that is generally found in colors such as pinkish-red, red, and orange. Although it is not a crystal, it is considered an organic gemstone like amber and pearl and we can thank living organisms for forming this gemstone. Talking in terms of biology, coral refers to both the hard exoskeletons of coral polyps and the coral polyp itself (which is a marine animal). Outside biology, the word “coral” can be used to refer to a reddish-orange color.