A neologism for “amethyst” coined by by Helge Fauskanger in his NQNT (NQNT), a combination of [ᴱQ.] helin “violet” and sar “stone”.
Quenya
linquë
hyacinth
helissar
noun. amethyst
Elements
Word Gloss helin “pansy” sar “stone (small)”
iasintë
noun. hyacinth
linquë (3) noun "hyacinth" (plant, not jewel) (PE17:62). The wording in the source is not altogether clear; it is said that the word lassë (leaf) "would not e.g. be used of leaf of a hyacinth (linque)". If linquë is not the term for a hyacinth, it must refer to the kind of leaf a hyacinth has. Compare #2 above.