Yes, Tolkien did state it clear and without doubt: female Dwarves had beards!
[“The History of Middle-Earth“; volume 11: “The War of the Jewels“; part II: “The Later Quenta Silmarillion”; chapter 13: “Concerning the Dwarves”]:
Quote:
The Naugrim were ever, as they still remain, short and squat in stature; they were deep-breasted, strong in the arm, and stout in the leg, and their beards were long. Indeed this strangeness they have that no Man nor Elf has ever seen a beardless Dwarf - unless he were shaven in mockery, and would then be more like to die of shame than of many other hurts that to us would seem more deadly. For the Naugrim have beards from the beginning of their lives, male and female alike; nor indeed can their womenkind be discerned by those of other race, be it in feature or in gait or in voice, nor in any wise save this: that they go not to war, and seldom save at direst need issue from their deep bowers and halls. It is said, also, that their womenkind are few, and that save their kings and chieftains few Dwarves ever wed; wherefore their race multiplied slowly, and now is dwindling.
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And from what else we learn from that chapter, it is not so sure that Aule thought at all about female dwarves! And if he did not, than it was Ilúvatars fancy not to change even a hair at the making of the woman that he managed.
Respectfully
Findegil