Kochi: Center of 'blood red' corals
• On the one hand corals are not particularly sensitive, but with a hardness of only 3.5, they are much softer than any other gemstone material. Their beauty can easily be impaired by the wrong treatment, as in, for example, cosmetics, hot water, or bright light. Coral jewellery should be kept in a safe place and from time to time cleaned with a soft, damp towel. If the surface of the coral does get scratched, the jeweller can have it repolished.