AS5124 Black Diamond
Cone 06 oxidation (large photo): Black Diamond is a black matte underglaze base with small black crystals that fire glossy.
Astro Gems are an underglaze-based textural glaze that contains tiny crystals. When fired, these crystals provide jewel-like spots on the matte surface of the glaze. Astro Gems can be applied to both green-ware and bisque.