The object was modelled in Wings3D, has 50% white diffuse and is fully reflecting. The torus has a radius of 127, is 25% transparent with 75% reflection. Both are in a transparent cube with a refractive index of 3 (300) and 25% reflecting. Light and colour by the Nccday_SC HDRI from the Seamless Texture Mix and HDRI Lighting Set 1 (available at Daz 3D). An icosahedron with a ring within a cube.