Common Heritage (IMAGE) Columbia Climate School Caption Crystals of the mineral olivine, taken from Grand Comore Island in the Indian Ocean, have a calcium-to-aluminum ratio similar to that of fluids found in diamonds. This suggests that both materials have a common source. Credit Courtesy Yaakov Weiss/Lamont-Doherty Earth Observatory Usage Restrictions Credit must be given. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.