Chill the Martini Glass: Place your martini glass in the freezer to chill while you prepare the cocktail.
Mix the Cocktail: In a shaker, combine the vodka, Blue Curacao, lemon juice, and simple syrup. Add ice to fill the shaker halfway.
Shake: Shake the mixture vigorously for about 15 seconds, or until the outside of the shaker feels cold.
Prepare the Glass: If you're adding the sugar-cinnamon rim, remove the glass from the freezer, rub the rim with a lemon wedge, and dip it in a plate of the sugar-cinnamon mix.
Strain: Strain the cocktail into the chilled martini glass.
Garnish: Add the orange twist to the glass. Sprinkle a dash of cinnamon or a pinch of gold dust over the top of the drink.