Sometimes friendly, sometimes not. That's something that can be said about the Snow Gem. She doesn't like the GemCaptor (Ceaira), but loves seeing people having fun in the snow. This is why she caused the amount to fall onto Reidenton that did. She was found and captured in the first section of Episode 4 however. Her form is a woman wearing a long sleeved dress, carrying a wand with a snowflake on the top.
The gang sensed the gem and went to find her, and they did. After summoning their weapons, Show attacked by calling up a blizzard. Sakura and Ceaira summoed the Firey Card and Firey Gem, which defeated Snow easily so she could be sealed. When summoned, Snow can create bliizards, flurries, or a very light snowfall. It can even create structures made out of snow. What a gem to have during a snowball war!