A Sindarin noun for a small individual stone or pebble (RC/327; VT42/11) in contrast to S. gond for large blocks of stone or rock (Ety/GOND) or stone as a material (PE17/28). However, sarn also functioned as an adjective “stony”, and when used unqualified could also refer to a “stony place” (RC/163). It was a derivative of the root ᴹ√SAR (Ety/SAR). In notes on the Common Eldarin Article (CEA) from 1969, Tolkien translated this word as “small stone, pebble, gem” (PE23/139), and I think the last gloss indicates this word can be used for valuable stones as well, in the sense “gem[stone]”.
Conceptual Development: This word dates all the way back to the Gnomish Lexicon of the 1910s where Tolkien had G. sarn “a stone” (GL/67), and it was also an element in the negative word ᴱN. orsarn “stoneless” in Early Noldorin Word-lists of the 1920s (PE13/156). It appeared as N. sarn, a derivative of ᴹ√SAR, in The Etymologies of the 1930s, but in this document it was glossed “stone as a material”, and also functioned as an adjective, apparently a blending of ✱sarnē and ᴹ✶sarnā (Ety/SAR), in contrast to N. gonn which in this document was only “a great stone or rock” (Ety/GOND). In later writings sarn could still function as an adjective “stony” (RC/163) but as a noun generally referred to an individual (small) stone, as in the name S. Edhelharn “Elfstone” (SD/128).
_n. _the South. Q. hyarmen. >> forn, har-