Colour gradient based on 3rd variable for geoshow points

Question

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So I have a script which puts points at each location for earthquakes based on a data set which amongst other things has data for lat, lon and magnitude. I used the latitude and longitude to plot the points but I want to have the colour of the points be on a gradient from red to blue as the magnitude goes from 7.5 to 2.5 so I can show where the biggest earthquakes happen. Here is my code so far:

%Import data from csv file
ds = datastore('earthquakesWWJan-Apr2019.csv','TextType','string');
ds.SelectedVariableNames = {'time','latitude','longitude','depth','mag','place','type',...
    'horizontalError','depthError','magError','dmin'}; 
data = readall(ds);
%create map
figure
geoshow('landareas.shp');
%add point for each earthquake on top of map
hold on;
geoshow(quakes.latitude, quakes.longitude, 'Color', 'red', 'MarkerEdgeColor', 'auto', 'Marker', '.', 'MarkerSize', 10, 'DisplayType', 'point')
hold off;
xlabel('Longitude');
ylabel('Latitude');