Gold Diamond Christmas Cake - How to make a Diamond Pattern onto a Cake

The idea of the diamond effect it came to me when I saw a mould for an ice cream roll (you can see it in the video if you’re curious) and then I tried to make something similar without any mould so that whoever wants to do it, can do it as well.

I’ve never seen a pattern like this onto a cake, so I think it’s an original design, however, I might be wrong.

I hope you like the idea.
Thanks
Fran