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DIFFICULT TO IDENTIFY : Diffusion-treated blue sapphires when heated with the same parameters get a colourless rim or outer layer which makes identification difficult. Most identification centres round inclusion zircon, glassy discoids which sometimes contain fern like feathers and retile crystals with blue halos. If there are no inclusion detection is very complicated. As the properties of the treated stone also do not change no evidence of treatment can be gathered easily. If the diffusion has penetrated thoroughly then identification requires sophisticated techniques like Secondary Ion Mass Spectrometry (IMS) and laser Ablation Inductively Coupled Plasma ass Spectrometry (LA-ICP-MS), which can detect the presence of beryllium.