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Quote:
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"There is a book in the Grand Line with Devil Fruits listed (although sometimes a Devil Fruit is said to have been unidentified). The most notable example is Blackbeard, in his search for the Yami Yami no Mi, catalogs a book which was also mentioned by Spandam and Sanji. Shanks and his crew already knew Luffy's Devil Fruit was the Gomu Gomu no Mi before he consumed it. Spandam mentions briefly that Devil Fruits have an aura around them which can often help identify them and that the two Devil Fruits he supplied to Kaku and Kalifa contained an unknown aura."
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Basically, it's lucky that Blackbeard's Yami Yami Fruit was listed, but as stated above... it is sometimes possible to be identified by their aura.