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【多选题】
扩散蓝宝石的鉴定方法有:
A.
放大观察，经长时间高温加热，宝石表面多少存在热烧蚀痕迹
B.
浸油观察，在二碘甲烷中沿刻面接合处和腰围见较深的色线或高凸起
C.
扩散处理宝石的边缘都很清楚，显示渗色层的特征。
D.
在短波紫外下，扩散蓝宝石表面可见有斑块状的蓝白色磷光
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