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 | When Trixie Belden and Honey Wheeler find a cut diamond embedded in the dirt floor of the old abandoned gatehouse, they set out to find whoever left it there. |
| Describes how crystals form in nature, how crystals are grown artificially, and how crystals are used in industry. Numerous color photos with text identify the various gemstones. |
| Describes how crystals form in nature, how crystals are grown artificially, and how crystals are used in industry. Numerous color photos with text identify the various gemstones. |
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