How many ways are there to describe a crystal or gem, if light touches the transparent or translucent surface, its brilliance can be described as "shiny" or "shining", as the light passing through the material is refracted and reflected from its internal surfaces, creating an effect of luminosity.
Also, if it has a smooth, reflective surface, its sheen can be described as "shimmering" or "shimmering," as light is reflected directly from its surface, creating a reflection effect.
based on how it is caressed by light, a crystal can be described with the words brilliant, shiny, shining, sparkling, shimmering, reflective, iridescent, luminous, lively, radiant, luminous, glittering.