This rare noun denotes a structure or construction, specifically something built into or as part of a larger building. Revelation 21:18 uses it for the construction or building material of the New Jerusalem's wall. The lexicon notes it can mean mole, breakwater, or built-in structure. John's vision employs architectural language to describe heavenly realities, with jasper construction symbolizing purity, strength, and divine glory. The term emphasizes the crafted, intentional nature of God's eternal city.