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It's been almost 30 years, and I just noticed Diamond Gauntlets give OTornado AND OWater. I thought I was going crazy for a while when I was changing around Cool/Warm/Fire/Ice shields on my mutants, then I noticed it was the Diamond Gauntlets providing the water resistance. That alone was worth replacing the battery in my cart.
I think you mean anti Ice. Any equipment with Thunder resistance provides anti Tornado and anti Ice element. This is why it's always handy to have one set of Diamond get on your character, because it covers an otherwise tricky resistance to obtain. Details here: https://gamefaqs.gamespot.com/gameboy/563274-final-fantasy-legend-iii/faqs/47306