Not really, but i would recommend using the sledge hammer to get rid of rocks, then use the pickaxe to get the rest away and uncover the jewels. Hope this helps.
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you dont get mining tools, you get them with the explorer kit
mining at about level 14
in eterna city the house next to the pokecenter
you take it to oreburgh city and bring it to the mining museum if you are talking about Pokemon diamond or pearl.
confuse it or put it to sleep.sleep her or master ball