i had a good customer come in the store last week with a 10 ct. diamond that belongs to her grandmother and said she is thinking about selling it. i call around and called rapaport but no one could tell me much. it has a spread cut. yellow but not fancy yellow. very clean si1 with a small chip on the girdle. set in platinum with two .40 vs fg tappered bagg. i talked with one broker and they said if it checked out they would pay 60k to 90k for it. seens a little low to me but i have no way of getting info. on a 10 ct dia. anyone have any ideas?