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Well, I am not that sure that the gems were not 'naturally' embeded in the walls. Since Gems were no longer invented by the Noldor, It is more then possible that Aule when building the Calacirya placed the Gems just below surface so that when the Noldor learned how to read the signs where to find Gems they diged a bit here and there and freed the Gems but let them be where they were.
Respectfully
Findegil
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