There's also the possibility the Aterians wore jewelry for the same purpose that many people do now as they favored the way it appeared and thought it enhanced their overall look. For the Ancient Egyptians glass was considered to be a synthetic semi-valuable stone and was a highly-priced novelty substance, https://medium.com/@spoilmevintagediy/the-rich-history-of-beadwork-a-journey-through-the-ages-4e4fd2e474cf