Rashi (in one of his Kisvei Yad), and Da'as Zekenim #1 and Rosh #1 (both in 35:27, citing Yoma 75a): This hints that the Manna, about which it says "ba'Boker ba'Boker", brought the precious stones and pearls.

Ramban: The people brought all their donations to the Ohel Mo'ed on the first day and the Chachamim took them from there on the first dasy and early in the second morning. And when the people brought more donations later on the second morning, Moshe instructed them to take them directly to the craftsmen.

Da'as Zekenim #2 and Rosh #2 (both in 35:27, citing Yoma 75a): To teach us that already on the second morning (from when they began accepting donations), there was more than was needed.