Different jewel colors in one movement

Lighting angle can change many colours/shades and hues.
As can post editing, usually made to look things "nicer".

Really hard to add more without decent unprocessed photos in natural daylight.

No concerns. Presence or absence of oil in a particular jewel can apparently cause what might be interpreted as different jewel colours. Watch jewels today are synthetic ruby, and they are very uniform in colour. In the 19th century, watch jewels were made of natural stones such as ruby, sapphire, aquamarine, spinel, even quartz, and agate. Check out this assortment of watch jewels from the 19th century, comprising ruby and sapphire. In particular, observe the red, to pink, to almost colourless rubies.