The stars made of light and silver paper https://3dsky.org/3dmodels/show/novogodnii_dekor_shvedskie_zvezdy 
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ARCHIVE:
max-2015 fbx obj Lights for stars maps
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MESH:
Polys: 41001 Verts: 42899
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UNITS:
System – mm Display – mm
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SIZE
Large star h 700mm
Small star h 411mm
Dimensions HxWxD 1609x1357x1732mm
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MODIFIERS:
No
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ADDITIONAL PLUGINS:
No
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MATERIALS:
Vray 3.6 / Corona 5

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BE CAREFUL:
!! Vray 3.6. In the version below 3.1 be careful – in the materials in the BRDF section there is Microfaset GTR (GGX). If your version is older than 3.1 the BRDF field will be empty. Choose Blinn Phong or Ward – which is preferable for you.

!! Corona 5. For Corona render it is recommended to install version 1.5 or higher as the glossiness of the materials is adjusted taking into account PBR.