Blue dragon egg is a very rare drop that can be obtained by killing blue dragons. It requires level 92 Farming to check. Though both a checked and unchecked dragon may be traded freely between players, only the unchecked variant may be sold on the Grand Exchange.
Upon obtaining an unchecked dragon egg the player receives the following message in chat: The dragon leaves an egg behind.
Dying with a checked egg in one's inventory will result in permanent loss of the egg.
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For an exhaustive list of all known sources for this item, see here