General Gleaming:
* Brilliant
* Sparkling
* Shining
* Luminous
* Resplendent
Specific Types of Gleam:
* Dazzling: A very strong and powerful gleam.
* Shimmering: A soft and gentle gleam, often with a bit of movement.
* Glittering: A bright and scattered gleam.
* iridescent: Showing a shifting range of colors, like a rainbow.
Other descriptive words:
* Radiant: Full of light and energy.
* Prismatic: Reflecting light in a spectrum of colors.
* Jewel-toned: Describing the rich, deep colors of a gem.
* Opalescent: Exhibiting a play of colors like an opal.
The best word for you will depend on the context and the specific effect you want to create.