Hi Sonja
The music for Emeralds is drawn from Fauré's suites of incidental music for two stage plays: Maeterlinck's Pelléas et Mélisande and for Shylock (a French adaptation of the Merchant of Venice).
Balanchine chose specific movements from each of the suites (for example he omits those movements that require a singer), and slightly reordered things, as follows:
P&M: 1 Prelude
P&M: 2 La Fileuse
P&M: 3 Sicilienne [also very as a standalone piece]
Shylock: 2 Entracte
Shylock: 4 Epithalame
Shylock: 5 Nocturne
Shylock: 6 Final
P&M: 5 Mort de Mélisande
I believe Amazon has a recording that presents the Jewels music. But it is also possible to buy a recording that includes both suites in their complete and original forms. For example, Plasson conducting the Toulous orchestra.
Hope this helps - it is indeed beautiful music.
Cheers, Yvonne
