Does anyone know where I can find a large 3D diamond (engagement ring) mold?
MAYBE THIS SKETCH CAN HELP YOU
I was looking for the same thing last year...never did find it. I ended up cutting my own. I checked out the link Loyilaw gave you and I wish I had seen that first. There is a picture of mine in my photos. Good luck.
I have seen this candy mold on Amazon
Here's one on amazon:
Here's another site that sells them.
One More, and this One is The Cheapest:
Good Luck!!! I hope this is what you were looking for!!!!!