Yellow Emerald Cut Moissanite

My girlfriend is deadset on a yellow emerald cut center stone for her engagement ring. Mined diamonds are not an option, and sapphires don't have the right sparkle. So it looks like it needs to be a moissanite, but C&C stopped making yellow moissanite as they were inferior or lost their color. Does this manufacturer produce anything that would suit my needs? Any other advice on yellow moissanite?
I bet Erica at loveaffairdiamonds could source one. She just listed some lovely light yellow cushions. They are just gorgeous. Plus, her prices are very reasonable.