score:5
There is no problem with the item you have listed; and there are no limits to the number of articles of jewelry you can carry on-board - assuming they all fit in your hand luggage and your hand luggage does not exceed the allowances for carry-on luggage (which you can find on the qatar airways website).
Personally speaking, unless you have a golden or silver knife, you will not have any problems. I have seen people wear multiple articles of jewelry, some even a large cross (which is more pointed than your samples) without issue.
The key thing is can it be used as, or confused for, a weapon.
Keep in mind that although there are no limits (other than the normal luggage limits), you may want to check what are customs regulations for your destination country.