David Klass OEC

[Sirenagirl]

David Klass will be sourcing a custom cut OEC for me. I've fallen in love with OEC's but know very little about the specifics that make one a good one. Are there optimal parameters for an OEC? I do know I would like the stone to have a nice amount of fire/flash and a pretty petal pattern. This is vague I know but it's also why I need guidance. I want to be truly happy with what I receive. Please help!!