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Answer first: Black onyx and obsidian can look similar in a bracelet, but they are not the same material. In gemological usage, onyx is a banded variety of chalcedony, a microcrystalline form of quart..

Answer first: Freshwater pearl quality is best compared by looking at seven separate factors: size, shape, color, luster, surface, nacre and matching. For most shoppers, luster is the fastest useful s..

Answer first: “Alashan agate” is a jewelry-market name generally used for colorful chalcedony associated with Alxa (Alashan), Inner Mongolia. Agate is a fine-grained variety of quartz, but the commer..