A diamond is not regular because all its angles are not the same.A diamond is not regular because all its angles are not the same.A diamond is not regular because all its angles are not the same.A diamond is not regular because all its angles are not the same.
Diamond is transparent to non-transparent, depending on the diamond.
Diamond is non-foliated.
Diamond is an allotrope of carbon (a non-metal).
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Diamond is transparent to non-transparent, depending on the diamond.
It can be. A diamond can also be a natural, non-living object.
In general, a diamond shape is neither a square nor a regular polygon. Only in an extreme form is it a square and therefore a regular polygon.
This key is non-existent.
A circle is non-polygon. Meaning it has a curved side. A circle has no sides. It is non-regular.
Regular polygon is equilateral and equiangular. Irregular polygon is non-equilateral and non-equiangular.
The term 'genuine, clean diamond' implies a generalist's description of what a gemologist would term 'natural, acceptably flawed diamond'. The term 'regular diamond' is as descriptive as 'regular human'. Any diamond is worth what someone will pay you for it.