A transparent white, smoky gray, or yellow Gemstone worth 50gp. A sharp blow to one of the crystals, including throwing it so it impacts a hard surface, causes it to burst in a 2m radius flash of blinding light. Any creature within the radius must succeed on a DC 10 Constitution saving throw or be blinded for 1 minute. A creature blinded by this effect repeats the Constitution saving throw at the end of each of its turns. On a successful save, it is no longer blinded.
