You are correct.

You can hear how it's pronounced in this YouTube clip:

https://www.youtube.com/watch?v=0GFZKPQuAaw

Sol: No, it's a moissanite. Bad Boy Lincoln: A what-in-ite? Sol: A moissanite is an artificial diamond, Lincoln. It's Mickey Mouse, mate. Spurious. Not genuine. And it's worth... fuck-all.

:)

Reading the first two lines made be expect a pronunciation clip in a language series on YouTube (blocked on the corp network).

Then I saw Sol and Bad Boy Lincoln. I guess I'll watch Snatch tonight. For educational reasons.