Combine the castor oil, argan oil, Cera Bellina wax, and rosehip seed oil in the top of a double boiler (or use a heat-safe measuring cup placed into a small saucepan filled with water). Simmer on the lowest heat setting until the wax is just melted.
Meanwhile, combine the cucumber seed oil, almond oil, and mica powder in a small bowl and whisk until you don't see any more clumps.
Place the melted castor oil mixture into a bowl that’s filled with lukewarm water. Whisk until the mixture starts to thicken.
Add the mica oil and continue to whisk a little longer.
Add the vitamin E oil and any essential oils you might like.
Transfer the lip gloss to a clean, dry tube or container. Let cure for 2–3 days before applying.
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Notes
To get the right consistency, it's really important that you weigh all the ingredients in this recipe using a kitchen scale.