AQ. [ɣ] became [j] between [i], [e] and a vowel; [{ie}ɣV] > [{ie}jV]

AQ. [ɣ] became [j] between [i], [e] and a vowel; [{ie}ɣV] > [{ie}jV]

Normally any voiced velars spirants ʒ that developed from g eventually vanished, but when it appeared between two e’s it became the semi-vowel y: eʒe [eɣe] > eye [eje]. This combination ultimately became ie. This phonetic development was mentioned in both the Outline of Phonetic Development [OP1] from the 1930s and the Outline of Phonology [OP2] from the 1950s, but the details differed:

Between vowels g > ʒ > y before ē̆ (ei), with the later development as original y (OP1: PE19/32).
After ē̆, ei, ī̆ a development g > ʒ > [ı̯] occurs before a following vowel. But this only produces results of importance in ē̆gē̆ > eı̯e > i(ı̯)e, as tege “line, road” > tie (OP2: PE19/70).

It seems in the 1930s, this sound change was triggered by following e or ei, but in the 1950s, this change was triggered by a preceding e, ei or i. In practice, all the actual examples show both a preceding and following e:

Furthermore, examples involving vowels other than e seem not to demonstrate this sound change:

There is a deleted note in OP2 that indicates a similar change of ʒ to w might have occurred between two o’s as well:

Between vowels and ē̆, ei a development g > ʒ > y often occurs; less frequently a development g > ʒ > w before ō̆, ou (OP2: PE19/71 note #15).

One example from The Etymologies of the 1930s seems to demonstrate oʒo > owo > uo:

In later conceptual periods the name Huor was taken from an Atani language, not Elvish (PM/348, 364 note #49), so the above derivation was no longer relevant. The sound change oʒo > owo seems to have been abandoned, though given the lack of examples it is hard to say this for sure.

Conceptual Development: Lack of examples makes it hard to tell if this sound change applied to the Early Qenya of the 1910s and 1920s.

References ✧ PE19/70-71

Order (03600)

Before 03800 [j], [w] often reduced between vowels

Related

Phonetic Rule Elements

[iɣV] > [ijV] ✧ PE19/70 (ʒ > [ı̯]; after ē̆, ei, ī̆)
[eɣV] > [ejV] ✧ PE19/71 (ē̆gē̆ > eı̯e)

Phonetic Rule Examples

teɣē > tejē eɣV > ejV tegē > Q. tie ✧ PE19/71

ᴹAQ. [ɣ] between a vowel and [e] and became [j]; [Vɣe] > [Vje]

Reference ✧ PE19/32

Order (03700)

Before 03900 [j], [w] often reduced between vowels

Related

Phonetic Rule Elements

[Vɣe] > [Vje] ✧ PE19/51 (g > y; before ḗ)
[Vɣo] > [Vwo]

Phonetic Rule Examples

neɣe > neje Vɣe > Vje ᴹ✶neñē > neʒe > ᴹQ. nie ✧ EtyAC/NEI
tegē > tejē Vɣe > Vje ᴹ✶teʒē > ᴹQ. tie ✧ Ety/TEƷ
weɣē > wejē Vɣe > Vje ᴹ✶weʒē > ᴹQ. vie ✧ Ety/WEG
xōɣorē > xoworē Vɣo > Vwo ᴹ✶Khō-gorē > ᴹQ. Huore ✧ Ety/KHŌ-N