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The rock is 4 inches (~10 cm) long. The vendor claims this rock is from K2. Are the blue spots real or painted on?

granite with blue spots

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The blue spots are natural. This rock is indeed granite from K2. The blue spots are azurite. Malachite is also reported from this same location. From Geology.com:

"K2 granite is named after a mountain in the Karakoram Range near the border between Pakistan and China. K2, also known as "Mount Godwin Austen," is the second-highest mountain in the world. The azurite granite is found in colluvium near the base of the mountain."

enter image description here

Reference

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