Whos got the best solution for a diamond light map? Advise please

MMM

Generally, the best way to go about creating a diamond sparkle effect is to use any image as a lightmap (make sure it's 256x256 jpg progressive), that has high contrast of details. Then, if you place that on a faceted geometry without any smoothing to represent a diamond surface, it will create a sparkle effect. Make sure to keep the geometry's specular wrap to 0 and it should work.