That depends on what you mean as a diamond. If you're referring to the simple two dimensional shape that's really just a rotated rhombus, then it has two (four if it happens to be square). If you're referring to the actual crystal then - in it's perfect form - it would be an octahedron, which has five planes of symmetry.
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A diamond symbol has two lines of symmetry.
How many triangies make a diamond?
A diamond has two pairs of parallel lines.
A 6mm stone would be a.75 carat diamond.
There are no carrots in any diamond. You can find carrots at your local farmers market.