He recognized the silverlight metal. This metal was extremely malleable, and a good additive for alloys to improve malleability. However, people would not usually do that, since it was a very rare kind of metal. It was not cost efficient to use it. Ye Chong was never interested in rare but useless metals, even though he could always recognize them. Ye Chong only knew about Skylee, which was a type of gem.
The pendant had a very interesting shape, like smoke, or flowing water. The thread circled around the Skylee gem in a whirl of fantasy. The necklace was intricately carved and very impressive. However, Ye Chong did not have the aesthetic sense to appreciate it. To him, it was only a typical example of useless luxury.
[1] Fuller - groove on the flat side of a blade (or in this case, spearhead), used to lighten the blade.