You can't because the guys didn't finish blue sea.
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You can usually find it in the Howling Horse Mine. If you go to that mine, the backround will be blue and the gem is blue. So that's a way to remember where you can find gems. For more examples, I found my Red Heart Ruby in the Muzzling Mine gem. I found the Diamond in the Buried Bones Mine.Hope this helps!- ClubPenguinLuvr :)
A zircon is a gem.
The Second Gem is in the Dotted Hole in 6 island, although when you get there a scientist will steal it and you have to got to the rockets base on 5 island and then you have the Second gem
the answer to this puzzling question is that ...................................... First you need to go to the SEVII ISLANDS and search for the hidden sapphire gem ....................................... believe me ! finding it would be even harder than catching mew ................................... but to every problem there is a hidden solution .................................................................. so, good luck finding the gem ............................ SAYONARA !!!
Well, you can find Gem Tone Crayons of Etsy.com