shop › A dichro tetrahedron. Image 1 of 5 Image 2 of 5 Image 3 of 5 Image 4 of 5 Image 5 of 5 A dichro tetrahedron. $850.00 This is a 2 1/4” tall dichro tetrahedron with rounded edges and intense Optics. Purchase Added! This is a 2 1/4” tall dichro tetrahedron with rounded edges and intense Optics.