I can clearly see Sherwin Williams "Sea Salt 6204" here. It's a soft, muted color which is both a green and a blue. These colors will really bring out the colors of your fireplace.
Due to individual computer monitor limitations, colors seen here may not accurately reflect the actual paint colors.
To insure your color choices, prior to painting always test actual paint colors on test boards such as those offered by Tru-Hue.