Every smooth del Pezzo surface of degree at least 3 over an algebraically closed field in characteristic 0 is defined over its field of moduli, but degree-1 and degree-2 counterexamples exist over C/R.
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Fields of Moduli of Smooth del Pezzo Surfaces
Every smooth del Pezzo surface of degree at least 3 over an algebraically closed field in characteristic 0 is defined over its field of moduli, but degree-1 and degree-2 counterexamples exist over C/R.