Transparency: the transparency of real agate is not as good as that of synthetic agate, which is a bit messy. Some can see natural waterlines or "clouds", while synthetic agate has good transparency and is as transparent as a glass ball.
Weight: Real agate jewelry is heavier than synthetic agate jewelry.
Temperature: Real agate is warm in winter and cool in summer, while artificial agate changes with the outside temperature. It gets hot when it's hot and cool when it's cold. First of all, choose according to your favorite color. Red agate jewelry is the most expensive. If you choose an agate necklace, you should pay attention to the consistency of each bead color, no noise, the bead size should be appropriate and the smoothness should be good. Then, lift the necklace to see if it is vertical and if each bead is hung on a line. If the necklace is bent, it means that some beads are biased and the processing technology is rough.
Commonly used imitations are Blackstone, Blackstone spike and so on. High-grade black agate is black and bright, pure and has natural texture; Imitation Blackstone and Blackstone are opaque and belong to natural products, but their hardness is low and their luster is worse than that of black agate. The specific gravity of plastic is much worse than agate, which means it feels floating, unlike agate. The handle and specific gravity of glass are similar to those of agate. Scraping the surface of agate with a small steel knife will not scratch the real agate (the hardness of agate is 7, and the hardness of steel knife is 5.5), but the glass painted with black paint will scratch and expose the white background.