Sorry I don't think it makes one
Three diamonds arranged in a line can form the shape of a triangle.
a cube
no
No, they are typically shaped like diamonds.
There is 1 Three of Diamonds in a standards 52 card deck of cards.
Three diamonds arranged in a line can form the shape of a triangle.
a cube
It only takes to diamonds to form a hexagon, but three if it is a regular hexagon.
no
Diamonds can be cut into almost any shape.
Spades, clubs or hearts can be used with diamonds to make a pair, three of a kind, straight, or full house in poker.
Do you mean diamonds as in diamond rings, or as in a pack of cards? If the crystal version, then you can't do anything with them other than by grinding bits off to change the shape.
Herkimer "diamonds" are twinned quartz crystals and so could be recognised by crystal shape alone. also, diamonds superior hardness would make it stand out from a Herkimer "diamond" if you were to test the two against a beryl or corundum crystal.
Octahedron
no
Three carat diamonds weigh three carats: that's how 'big' they are.
The Three Diamonds - 1929 was released on: USA: 11 November 1929