An ornate, clear, crystalline statuette with a gemstone at its core is in fact made of bitter ice.
If touched, it adheres to the hand, dealing 1d3 cold damage per round.
If forcefully removed, it deals an additional 1d6 damage.
If melted, the process deals 1d6 fire damage.
Pouring water over it melts it [unnaturally] quickly and deals no further damage. The gemstone at its core can be kept as a treasure, although it may be a cursed item (GM's option).
micro photography of bubble by Aaron Burden. Unsplash License.