If the 28 points to which you refer are based on a scale of 100 points equal to one carat, then these 28 points could indicate that the diamond in question weighs just over one quarter of a carat or 28/100ths.
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8 collinear points determine 28 unique line segments
The distance between these two points is 23.
28
How about: 2+6+8+12 = 28 as one example
You could use 28*4 = 112 quarters