Good question. I assumed diamond, but as you mentioned this, it does say "This one's a honking 4.77ct equivalent 10 x 8.3mm." hmmm.... I asked on IG, but maybe @Rhino will stop in and let us know.
NOOOO!!! So very sad. But, it really does not have any of the distracting dispersion of other EC moissy.
Diamond and moissy have different gemological properties with regards to refractive index (the speed of light as it travels within the gem) as well as the double refractive factor (1 beam in 2 beams out) but this g-man also happens to know how to alter the gems geometry to handle light similarly. I've put a lot of my cutters plates at the moment so you're getting a little preview of things to come until they are ready. Once final plans for the Oval are completed they've already asked me ... "what's next?". I have another 2 planned I've been working on over the past 2 years I'm hoping to release this year as well. 
Stay tuned.
@Rhino, don't you have your own version of an asscher? I seem to recall a real beauty.
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