Tintin and the Broken Ear - the Diamond

I remember the Fetish contained a Diamond that was said to protect one from snakebite - but that's all

Was there any other information / historical influence for this element of the story?

I'm wondering if the Diamond is maybe influenced by one of those "cursed" historical stones - like the Hope Diamond where whoever owns it will suffer misfortune / or the Koh-i-noor bringing misfortune to men but OK to be worn by women