Good color is a combination of color gamut (to show more colors) and delta e (the deviation from the color it's supposed to be showing vs the color it is showing) which you'd only find in pro reviews. 70% adobe rgb, 100% srgb is around your average decent display. A good pro monitor will be 90%+ adobe rgb. Delta e you want <2. The only way you'd get accurate monitor specs is with a pro review of the monitor. The spec sheet can be wrong as companies tend to just put the norm, like 72% srgb and 1:1000 static contrast on all monitors even when they aren't capable of that.
At least that's the simple explanation. There's lots of other things that get tested for good looks like delta e for saturation, gamma, grayscale, luminance, contrast ratio, color uniformity, brightness uniformity, etc.