Snowflake Obsidian Eyeglass / Sunglass Necklace. Measuring 27 inches long and quite light weight and dainty considering this eyeglass / sunglass necklace is made with lava rocks, or also known as in this case, Snowflake Obsidian. Pretty faceted crystals with a touch of copper color and tiny copper tube beads make a feminine accompaniment for a volcanic look!