Identification method of obsidian Obsidian is a common black gemstone, and because of its unique formation process and physical properties, many counterfeits have appeared in the market. In order to help consumers distinguish between true and false, the following are some obsidian identification methods: Observe the rainbow eye Rainbow eye is one of the important features of obsidian. Under strong light, the surface of natural obsidian will appear colorful rainbow. And different obsidian, rainbow eye will be different 2. Check for bubble eyes Obsidian often has many small bubble eyes inside, and these bubble eyes are in a flowing structure. Fake obsidian is usually made of glass or other materials without such bubble eyes 2. Feel the temperature Natural obsidian has a low temperature and a cold feeling when touched. This feeling will gradually disappear with the extension of the holding time. In contrast, fake obsidian usually does not have this distinct sense of iciness 3.