The Dreamlight Valley Great Blizzard questline is a long one, continuing the story of The Forgetting and the part you played in the terrifying mysteries that have befallen the valley. In order to complete these quests, clear up the great blizzard, and save the Frosted Heights biome - as well as bring Olaf back to the valley - you'll need a few rare resources, including some very specific gems.
Just like in the Dreamlight Valley mystical cave riddle and Mickey's secret door quest before it, the Dreamlight Valley Great Blizzard quests task you with working out which three specific gems you need to retrieve the new Love Orb. Before that though, you also need some other rare resources, and you need to know how to find Olaf in Dreamlight Valley.
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