A crystal grid,  , is a grid on which gemstones can be laid out in a geometric way. You place the gemstones with attention and an intention, wish or dream. Because you make a crystal grid  to manifest something beautiful. Such as 'attracting abundance' or 'expelling negative energy' or 'gaining more self-confidence'. So you have a clear goal in mind when laying a crystal grid.  Let your intuition do the work. 
 
This mandala crystal grid  is made of birch wood and is 10 cm in diameter. Also available in 15 cm diameter.