 |  | | | Sapphires | 23 Jan 2007 | | |
After diamonds, sapphires are the next hardest stone. But you might be surprised to learn that they're not all blue. In the next in our series on gemstones Claudia Hammond speaks to Victoria Finlay, the author of "Buried Treasure" and Jack Ogden, Chief Executive of the Gemological Association of Great Britain.
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