One Gem is at One island and the other one is at Four Island. this is not true it is near island 6
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When you give him the ruby and sapphire gem.
After you have obtained and restored the Sapphire gem, you now are given the ability to trade with trainers from the Hoenn region. Mind you these need to be your real life friends, and they can give you all the Pokemon from Ruby, Sapphire, and Emerald.
A sapphire is any gem-quality corundum that is not red or pink.
A sapphire. ( it is a pretty blue)
You get the fire gem from the fire mages in the undeadportal.