Gradient Colorize Chart Points Based On Cell Reference

Conditional formatting is lacking. I need to colorize each data point on the graph according to a characteristic cell (not an x-axis or y-axis variable). I have done something similar by simply graphing a group of points as a series and changing the series color. I'm looking for a more graceful solution. From the example picture attached (i would attach a workbook, but the data is sensitive), a point is charted based on two variables and colorization is attempted based on the third variable. i would find the range of the third value, assign a gradient based on the spread, and colorize each point. My VBA syntax is lacking for chart functions