"One can reasonably expect anywhere north of $100/ct"
Listen from 26:18 for full explanation.
He is being coy to setup an under-promise over-deliver scenario. From their rough Ruby grading system, they know the reserve prices they will be setting and their quality and size mix.
Vincent Pardieu, the pre-eminent expert on Mozambique Ruby was their consultant that helped setup the grading system. His job as a field gemologist, to hunt down Ruby wherever it is found ...