Checkering is the process of cutting a series of evenly spaced lines that intersect at a set angle. The spacing of the lines determines how fine the checkering is. The depening of the lines results in a series of fully pointed diamonds, which add the finishing touch to any stock.
Original checkering can be touched up or completely recut. Or new checkering can be added to a new or old stock. Checkering is typically the last thing to be done to a stock. Being cut over top of the finish.
Below are some various examples of checkering.