Difference 1: hardness difference
Sapphire is harder than tanzanite, and the hardness of sapphire and tanzanite is quite different by instrument detection. Although the hardness can't be sensed by hands, it can be detected by instruments, or the hardness difference between tanzanite and sapphire can only be known by scratches.
Difference 2: Grade difference
Many people have heard of sapphire even without it, but many people have never heard of tanzanite. Even if I have seen it, I have only seen it once in Titanic and TV dramas. In real life, more people prefer sapphire, which makes sapphire very famous and naturally has a high grade.
Difference 3: size difference
Sapphire is rarer than tanzanite. Sapphire is very precious and difficult to handle. Carelessness may cause sapphire damage, so sapphire is smaller and easier to cut tanzanite. In addition, it is not a famous gem, so the cutting area is naturally large, and the larger the grams of Tanzanite, the more valuable it is.
Difference 4: Impurity difference
Sapphire luster is bright glass luster, and tanzanite is glass luster, but the transparency is very good, from which we can see the difference of gem impurities. Although sapphire is bright and shiny, transparent sapphire has better luster and is very clear, so the impurities of tanzanite are much less than sapphire.
In addition to these differences, there are actually many differences between tanzanite and sapphire, but if you really buy one of the gems and want to tell whether it is true or false, or whether it is tanzanite or sapphire, you'd better go through machine testing, so that the test results are more reliable.