Septium (七耀石, sepuchiumu) is a grouping of seven types of gemstones, found and actively mined across Zemuria. Septium have been viewed as symbols of mystery since ancient times. Their value as a resource increased drastically when the technology to refine fragments of septium, also known as sepith (七耀石の欠片, sepisu), into quartz was developed. Larger chunks of septium are refined into jewels.
Types
| No. | Element | Official name | Colour | Sky | Crossbell | Cold Steel (E/J) | Akatsuki |
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| 1 | Earth | Amberl | Brown | 
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| 2 | Water | Sapphirl | Blue | 
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| 3 | Fire | Carnelia | Red | 
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| 4 | Wind | Esmelas | Green | 
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| 5 | Time | Nohval | Black | 
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| 6 | Space | Goldia | Gold | 
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| 7 | Mirage | Argem | Silver | 
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