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If by a diamond you mean a square tilted up onto a corner, and you wnt a 3D shape something like that, probably the best answer is an octahedron, which has 8 triangles as faces; see http://en.wikipedia.org/wiki/Octahedron.
You might also go for the triangular dipyramid, which has 6 triangular faces and is made by sticking two triangular pyramids together;
see http://polyhedra.org/poly/show/56/triangular_dipyramid - you can rotate the image to get a better idea of what it looks like. There are other dipyramids: the square dipyramid is the same as the octahedron; there is also a pentagonal dipyramid and more.
It is better to actually make some of these by cutting equilateral triangles out of paper and sticking them together.
If you mean what shape is a real diamond in a piece of jewellery, that is a specialised topic, which I don't know about. There are some images of different diamond cuts at
http://en.wikipedia.org/wiki/Diamond_cut.
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What is a diamond like 3D shape?
A parallellopiped
What is the correct name for a 3D diamond shape?
Its an eqaulateral tringle
What is a 3d diamond?
it is a 3D shape with 8 faces 8 edges and 6 vertices if you want a picture of it type in pcures of 3D diamonds.
Can 2D shapes be turned into 3D figures?
only if it is in a certain shape, although the 3d shape would not look exactly like the 2d one, take this, if a square were to be turned into a square, it would have to be extended, but if you were to do this it would just stay as a 2d square, in a 3d world, but if it were a net (like the t cube) then yes, it would be able to become 3d
This 3d shape has a corner on a shape?
Many 3d shapes have a corner.
What is a diamond like 3D shape?
A parallellopiped
Why is a diamond a 3d shape?
A cut diamond is a 3D object as it has length, width and depth (even if it is roundish like a pebble)
What is a 3d shape sphere look like?
By definition a sphere is 3D. If it were only 2D it would be a circle.
How does a rectangular prism look like?
a rectangle in 3D A brick shape.
Is a diamond a 2D shape or a 3D shape?
A diamond is a 3D shape, specifically a type of polyhedron known as a rhombus. A rhombus is a quadrilateral with all sides of equal length, opposite sides parallel, and opposite angles equal. In a three-dimensional space, a diamond shape is a polyhedron with four faces that are congruent rhombi.
Is a rhombus a 3d shape or a 2d shape?
A rhombus is a four sided polygon, a quadrilateral. It is a 2d shape. 2d shapes have 2 dimensions, like length and width. 3d shapes have 3 dimensions, like length, width and depth.
Can a diamond be a 3D shape?
Yes but the correct term is octohedron
What does a parallelogram in 3d look like?
A parallelogram in 3D looks like a flat, four-sided shape where opposite sides are parallel. It can appear as a slanted rectangle or a diamond shape depending on the orientation of the sides. The angles between the sides can be acute, obtuse, or right angles.
What does a nonogon look like?
It looks like a 3D shape that has 9 sides (the cousin of an octogon).
What is the correct name for a 3D diamond shape?
Its an eqaulateral tringle
What does a 3d shape with 6 rectangular faces look like?
A box - for example a box of cereal
How does a 2D shape look different from a 3D shape?
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.
