Heat treated red spinel
It is rarely cased to be found as heat treated spinel. Once we experienced to check the red spinel packet and the one spinel had odd inclusions from those of other red spinel. The inclusions look get thermal expansion around the solid octahedral crystals and some tiny crystal has completed glassy tension halo, meanwhile totally differing from natural spinel inclusion of octahedral crystal with starburst like halo. Our Gemmoraman make confirmation as heated spinel by showing broaden Cr emission photoluminescence spectrum of heat-treated spinel.
