There are 4 sounds that an amethyst block makes when placing and breaking it, each consisting of a different note of amethyst resonating. On Java edition, the notes are of an A minor dominant seventh arpeggio, A, C, E and G. On Bedrock, it is pitched higher, at C sharp, E, G sharp and B.

In 1.18, Lena Raine composed a soundtrack for the update titled "Infinite Amethyst", and it's key is in E flat major.

Therefore, to address the parity difference, amethyst blocks should produce sounds in the E flat major arpeggio, which is E flat, G and B flat.

I am creating this report because this design is also seen with some of C418's music and note blocks. Specifically, the fact that note blocks start from the note G flat and spans 2 octaves, while his soundtracks "Mutation", "Beginning" 1 and 2 (transposes to E flat minor, the parallel minor of G flat major), and "Floating Trees" that plays in the menu, and the tracks "Minecraft" and "Key" that plays in game are all in G flat major. In addition, arguably the most iconic musical motif in the game, that is "Mi, Re, La, Sol", or "B flat, A flat, E flat, D flat", is in G flat major and can be heard in the beginning of "Mutation" and "Minecraft", as well as referenced in the credits music "Alpha", albeit in different keys.

So if note blocks were made to start with the note of the game's iconic motif and various soundtracks, then amethyst blocks should follow suit and produce the notes of the key in "Infinite Amethyst" to stay consistent with the design.