Strongest to weakest Jewels

I'm only doing the Precious Jewels! Ruby:-> 9. Ruby is the strongest in the group. Sapphire:-> 9. Sapphire is the second strongest Jewel. Topaz:-> 8. Believe it or not our fiery fun girl is the third strongest. She may not take her job seriously but when she does...she's strong! Spinel:-> 8. When she's protecting Amethyst she can beat a person up. She managed to serverly hurt Pink Pearl with no problem Pearls are the weakest gems on a scale to 2.5-4.5 So it was easy! Emerald:-> 7.5-8, depending. He may seem weak but he's the fifth strongest! Amethyst:-> 7. She may seem motherly, cute, sweet, bubbly, gentle and submissive but she could kick your ass! Citrine:-> 7. A citrine gem is a Quartz like an amethyst so she's on the same level as Amethyst. She can be serious sometimes.

Trivia

 * Their strength is based off the hardness of their signature gem.