From a Persian prince to the American “jeweler to the stars,” the world’s largest cut blue diamond has a lengthy history.

Turquoise Persian Grill, 36 Lincoln Ave., Roslyn Heights, 516-277-1950, turquoisepersiangrillnbar.com. Open noon to 10 p.m.

Striking gold jewelry and weapons made by Sarmatian nomads have been unearthed from three burial mounds in Kazakhstan that ...