The Amethyst Imperial Grand is sampled from the well-known Yamaha C7 Grand Piano. The soundfont consists of 88 lossless FLAC samples, for the best sound quality possible. There are a total of 20 default dynamic velocity layers for realism, as well as a preset pack with 128 velocity layers (created by KaleidonKep99). You can find a total of 44 SFZ presets, so you can get exactly the sound you are looking for!
There are also some interesting addon packs: One of them is a selection of string samples mixed with the piano to give it a “dreamy” or “fantasy” feel, while the other one uses the samples from the infamous XP-80 Super piano soundfont, as well as its fantasy sound pack.