| 41. | A few species produce pearls that can be of interest as gemstones.
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| 42. | Hue is commonly understood as the " color " of the gemstone.
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| 43. | Blue topaz is the state gemstone of the US state of Texas.
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| 44. | This is one example where inclusions increase the value of a gemstone.
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| 45. | The black fire opal is the official gemstone of Nevada.
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| 46. | Gemologists study these factors while valuing or appraising cut and polished gemstones.
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| 47. | It was made in 1630 and is set with around 70 gemstones.
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| 48. | Turnov has long been known for its expertise with gemstones.
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| 49. | Like bronzite, it is sometimes cut and polished as a gemstone.
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| 50. | Its cross-guard and grip is decorated with gemstones.
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