In recent years, an increasing number of rubies and pink sapphires have come onto the market, after having previously undergone so-called “low-temperature heating” (below 1000 °C), meant to slightly shift their colour to a better hue. Furthermore, as was reported in 2022, certain rubies and pink sapphires, some with a slightly purplish tint, have been treated by a limited number of individuals using radiotherapy equipment designed for cancer patients. This treatment can also induce a shift of the colour centre to a more attractive hue. At the meeting in Basel, the LMHC labs decided to carry further research on these corundum treatments, in order to develop harmonised criteria for detecting their use. “We are very pleased to see that all laboratories represented at LMHC are constructively working together for a harmonisation on issues that are important towards ensuring consistency and clarity in gemmological lab reports,” said Dr Michael S. Krzemnicki, host of LMHC, summarising the progress made during the meeting in Basel. Follow DiamondWorld on Instagram: @diamondworldnet
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