Blood Necklace

The Blood Necklace is an item which you normally get through the skill Dungeoneering, but in this case you can only donate for it.

Information
There aren't many blood necklaces in the main game, which makes them fairly unknown, but yet still powerful, with a tremendous +11 Strength Bonus from a necklace, which is currently the highest Strength Bonus ingame from a necklace. The Blood Necklace can go for up to 200 Billion Gp.

Trivia

 * As of 26th of April 2014, there are only 2 Blood Necklaces ingame. One owned by Aries and one owned by Zerkia.
 * Despite having a high Strength Bonus, the Amulet of Fury is often a better choice, due to it's higher stats in most attack stats and all defence stats and also having a +5 Prayer Bonus, despite only having a +8 Strength Bonus.