Opened a Chest to get a gemstone

So, today I opened a chest with a key and I got a Gemstone and a skin shard, which isn't that big of a deal. When I rerolled the gemstone into a chest and key (I don't want any of the loot only skins) I got a skin shard... and another gemstone. I rerolled that one and behold I got yet another gemstone lol. After that I just got a Karthus shard, but I managed to get three gemstones in a row from chests. :D