A crystal engraving blank is a transparent optical material designed to accept internal laser marks without visible cracking. The material must allow controlled internal fracturing while maintaining structural integrity.

Optical clarity is important because the engraved image relies on light scattering. Impurities or bubbles reduce visibility of the internal points.

Blanks are commonly paired with illumination bases to enhance contrast and depth perception.

The engraving data for these blanks is typically prepared using subsurface engraving software such as Cockpit3D.