Corallium rubrum or better known as red coral, are one of several species of marine coral.
Corals comes in many different shades of pink to deep red. These corelli rubrum species have been used in jewelleries and artefacts for thousands of years.
Nowadays, natural corals are rarely seen, their shade varies due to the coral reef exposure to the natural sunlight and of course, the age of the actual piece. An untouched piece of coral will show its inclusions, indicating the lack of natural light and the shaded areas of the seabed.