1. zekukith (Job 28:17), probably glass highly ornamented, such as was made in Egypt: it is here classed with gold; but wisdom, the gift of God, far exceeds such things in value.
2. gerach, ice, and so frequently translated. The firmament over the living creature was “as the color of the terrible crystal” (Ezek. 1:22).
3. κρύσταλλος. John saw a sea of glass like unto crystal (Rev. 4:6); the water of life and the jasper stone were seen “clear as crystal” (Rev. 22:1). The ancient glass may have been “clear” in the sense of not having spots and blemishes, without its being wholly transparent.