FULL PRODUCT VERSION :
Java(TM) SE Runtime Environment build 1.8.0_60

ADDITIONAL OS VERSION INFORMATION :
Windows 7 64-bit,
Ubuntu 14.04
MacOS 10.10

A DESCRIPTION OF THE PROBLEM :
I've found a very strange thing about JavaFX and borders.

If an element has "-fx-border-width: 1 1 1 1;", then the border will be a bit blur (not exactly 1px).
But if it's declared as "-fx-border-width: 0 1 1 1;", then the border is perfectly sharp (exactly 1px).


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
SharpAndBlur.java

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class SharpAndBlur extends Application {

@Override
public void start(Stage primaryStage) throws Exception {
HBox box = new HBox();
box.setId("box");

Label sharp = new Label("I am sharp");
sharp.getStyleClass().add("label");
sharp.setId("sharp");

Label blur = new Label("I am blur");
blur.getStyleClass().add("label");
blur.setId("blur");

box.getChildren().addAll(sharp, blur);

Scene scene = new Scene(box, 300, 200);
scene.getStylesheets().add(SharpAndBlur.class.getResource("SharpAndBlur.css").toExternalForm());
                primaryStage.setScene(scene);
primaryStage.show();
}

public static void main(String[] args) {
launch(args);
}

}

SharpAndBlur.css

#box {
-fx-background-color:linear-gradient(#56595a, #3f4143);
-fx-alignment: center;
-fx-spacing: 20;
}

.label {
-fx-min-height: 29px;
  -fx-pref-height: 29px;
  -fx-max-height: 29px;
-fx-padding:0 15 1 15;

-fx-alignment: center;
-fx-font-size:13px;
   -fx-cursor: hand;

  -fx-background-color: transparent;
-fx-background-insets: 0;
-fx-background-radius: 2;

  -fx-border-color: rgba(234,234,234);
  -fx-border-insets: 0;
-fx-border-radius: 2;
}

#sharp {
-fx-border-width: 1 0 1 1;
}

#blur {
  -fx-border-width: 1 1 1 1;
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
As a workaround I defined border as: -fx-border-width: 0 1 1 1, 1 0 0 0;
But if the border has rounded corners, this workaround (even with border-insets) produces different rounded corners.