nostr:npub17czt0gwf5lfr6v3fj06teh8tlhvzy8gs4duzg09gex5uxll420mq9lutc6 - again the answer is obvious from the laws of physics: yes, antimatter makes gravity.  But again, testing it will be major nuisance.  The lightest object whose gravity we've deteted is a 90-milligram gold sphere:

https://arstechnica.com/science/2023/09/antimatter-falls-downward-not-upward-just-like-regular-matter/

But it was shaken back and forth, not easy to do with antimatter!   And antimatter currently costs about $60 billion per microgram, which would be $5.4 quadrillion for 90 micrograms.  Even worse, that quoted price is for antiprotons, which wouldn't work: antihydrogen would cost even more!

https://en.wikipedia.org/wiki/Antimatter_weapon