Why does my Gem counter not work? (screenshot included for explanation / easy code)

Hey everyone,

I have four UI text on my canvas:

• blueGemText

• greenGemText

• redGemText

• diamondGemText

Now, I have this following script attached to each of the Text elements.

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class GemCounter : MonoBehaviour {
 
     static Text scoreText;
 
     //bools
     public bool blueGem = false;
     public bool greenGem = false;
     public bool redGem = false;
     public bool diamondGem = false;
 
     void Start () {
         scoreText = gameObject.GetComponent<Text> ();
     }
 
     // Update is called once per frame
     void Update () {
 
         if (blueGem) {
             scoreText.text = Score.blueGems.ToString ();
         } 
         if (greenGem) {
             scoreText.text = Score.greenGems.ToString ();
         }
         if (redGem) {
             scoreText.text = Score.redGems.ToString ();
         }
         if (diamondGem) {
             scoreText.text = Score.diamondGems.ToString ();
         }
     }
 }

On each UI Text I set the correct boolean. For example on the blueGemText I checked the 'blueGem' boolean set to true. Now when I run the game only the blue gem counter gets updated every time I pick up a blue gem. The green, red, and diamond counter all stay the same. (However, when I die, and the scene resets, it suddenly starts counting the green diamonds and the rest stays the same)

I already also tried using 'else if' statements and using tags, but that didn't work either.

What am I doing wrong here?

Thanks in advance -- Nathan.

Including screenshot for reference: