How to Make a Synthetic Diamond

Step 6 Set the Graphite on the "Crucible"

Here's the ingenious part of the project. Turn one of the coffee mugs upside-down. (I used a slightly larger one as the base.)

Set 2 more pieces of graphite (non-oiled) on the upturned mug, parallel to each other.

Lay the oiled graphite across the other 2 pieces.

Place the other coffee mug over all of it.

Presto! It's a makeshift crucible!