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MediumÂ pink lab created ruby corundumÂ gemstones, 3mm size, 5 stones. Corundum has a very high rating on the Mohs scale providing them with a high heat tolerance.
Fireable:Â Firing ofÂ theseÂ stones isÂ possible. ResultsÂ mayÂ vary depending on the firing temperatureÂ withÂ slight color changes of the stone possible.Â Precaution against thermal shock required