Yes pluto isn't considered a real planet anymore but it's still a vital part of planet systems. but it's classified as a subplanet.

looking through a tarot book called Introduction to TAROT by Susan Levitt. I found stones that relate to these three planets.

Stones that are related to Uranus are Azurite,chrysoprase and chrysocolla.

Stones that are Neptune are blue sapphire,aquamarine,turquoise and blue topaz.

Stones for Pluto are Herkimer diamonds,rutilated quartz, tanzanite and the chalcedony family.

in the chalcedony,it conflicts with her list of Mars stones which includes red jaser and carnelian which are both chalcedonies.


some people will associate purple stones like amethyst with neptune and stones like the obsidians and rocks that came from space like meteorites and teckites.

yet still
Uranus : Tourquoise, Aquamarine, Labradorite, Falcons Eye,Turquoise ,Amazonite. Malachite

Neptune : Amethyst, Opal ,Moonstone, Sapphire, Aquamarine

Pluto: Opal Hematite Bloodstone/Heliotrope, Pyrope Garnet, Amethyst
Alexandrite; Dark Burgundy Thulite, Pyrope Garnet, Andradite/Rainbow Garnet; unpolished or polished Hematite, Mohogany Obsidian agates in general.

although malachite is also classified as a stone of venus. and some people refer to meteorites belonging to the astroids like Chiron phollus,etc.