You can add a dark color outline, or frame, to markers in a JMP plot or graph. See Change the Size of Markers.
To add outlines
1. Right-click a plot or graph.
2. Select Graph > Marker Drawing Mode.
3. Select Outlined.
To use an outline effectively, it is best if your marker is a color other than black.
To change marker colors
1. Highlight the markers whose color you want to change.
2. Right-click anywhere in the graph.
3. Select Rows > Row Colors.
4. Select a marker color from the options that appear, or click Other to apply a custom color.