Early Quenya
nindon
noun. lapis lazuli
ningon
noun. lapis lazuli
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A word in the Qenya Lexicon and Poetic and Mythological Words of Eldarissa of the 1910s glossed “lapis lazuli” as a combination of ᴱQ. nin (nind-) “blue” and ᴱQ. ondo “stone” (QL/66; PME/66). In the Qenya Lexicon ningon was written below it and a faint line was drawn through the first part of nindon, possibly indicating a replacement as suggested by the editors.