How to plot a holo 3d column?

I am trying to plot a 3d column in GMT6.5. I want to plot a holo 3d column. I try -G- option and also without -G, but the output is black column. please help. Thank you so much.

I apologize for my ignorance. I used
“gmt psxyz xyz.dat -Jz0.125c -So0.25c -G- -p -W0.1”
where xyz.dat contain lat long and z value
Additionally, I am using Windows 10 operating system. Again I am sorry for the inconvenience.

Looks like you forgot to include a minimum example that demonstrates the problem, e. g. something like

echo x y z | gmt plot3d ....... -png map

or similar so we can examine. You also forgot to tell us what operating system. So, no help can be given.