Add 1 cup of chopped dark chocolate to a pot on the stove set to low heat (reserve the rest of the chocolate for later).
Cook, stirring constantly, until the chocolate has melted completely, then remove the pot from the heat.
Transfer the melted chocolate to a bowl.
Add the rose water to the bowl, then mix until smooth.
Place the chocolate rose water mixture in the fridge to chill for 25 minutes.
Scoop out 2 teaspoons of the chocolate rose water mixture and use your hands to form it into a ball (wearing kitchen gloves makes this easy and mess free).
Place the chocolate ball on a plate lined with parchment paper or a silicone baking mat, then repeat with the rest of the chocolate rose water mixture (you should end up with 12 balls).
Add the remaining 3/4 cup of dark chocolate to a pot on the stove set to lose heat, then cook until melted, stirring constantly.
Transfer the melted chocolate to a bowl.
Add one of the chocolate rose water balls to the bowl of melted chocolate and use a spoon to gently stir, ensuring that the ball is completely coated in melted chocolate.
Use two forks to lift the chocolate ball out of the bowl of melted chocolate, allowing any excess chocolate to drip into the bowl, then place it back on the plate lined with parchment paper or a silicone baking mat.
Add a sprinkle of dried rose petals on top of the truffle.
Repeat steps 10-12 with the rest of the chocolate balls.
Place the plate of truffles in the fridge to harden for at least one hour, then leave them out at room temperature for 30 minutes before serving.