Playing mostly online, I like to image dump in d&d so I can quickly communicate an idea or a vibe without neccicarly *preparing* or *doing any work*, and magic items can be hard because they are typically "an amulet", rings, whatever. Not very evocative and hard to find nonstandard images.
Primarily made of Precious Coral, or Red Coral they are horrifying and opulent and dark and organic.
Also featuring exotic flowers, pomegranates, angels and demons, severed fingers, bees, all of my favourite things.
These are certainly things I would show to elaborate on the strangeness of finding an exquisite and delicate golden flower in the midden heap of an ogre cavern.
A blasphemous vivisected relic made of blood red wood (?) atop a lustorous blue sphere in the deacons secret study.
A gemstone pomegranate heart locket tangled in the ribcage of a long dead blonde warrior. The seeds nestle in soft golden honeycomb
Pearls, lustrous and large, but melted like wax, a beautiful horror. Extracted from fleshy dungeon pool clams, they come out like pulled teeth.
Red coral, forking like mangled fingers of a ghastly red hand. Rumoured to be the severed members (on of uncountable frills) of a shoggoth.
A severed finger in jade, real bone juts from the cut end. The nail (golden) needs trimming every few days and is pure gold.