Create a diamond shader by simply following this tutorial steps
Cinema 4D Modeling and Animation
[C4D] Diamond shader and Topolgy
Step by step diamond shader settings
Note: so that diamond materials works well so diamond shape must right
Now, you can use pictures under this for the topology
1. Color
2. Transparency
3. Reflection
4. Specular
Top
Right
Front
Final result
Capturing
Screenshots
table of contens
UPDATE :
How to create a diamond shape step by step here
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