U-Treasure, a company that deals in authentic character jewelry for adults, will release a half eternity ring featuring Pikachu from Pokémon on November 11th, 2021. This new ring features a three-dimensional design of Pikachu's tail on both sides of the diamond clasp, and silhouettes of male and female Pikachu engraved on the inside. It is a straight line ring that can be easily stacked with your existing rings. A silver ring with the same design and cubic zirconia will also be available for pre-order from the same day through November 30th, 2021. It will be available at the U-Treasure Concept Store Ikebukuro and the U-Treasure Online Shop.

Pokémon Pikachu Half Eternity Ring (ポケモン ピカチュウ　ハーフエタニティリング)

A simple and elegant half eternity ring. This ring can be worn for any occasion.
Price including tax: 148,500 yen (Platinum 950 x K18 Yellow Gold), 132,000 yen (K18 Yellow Gold), 19,800 yen (Silver with Yellow Gold Coating)
Silver with Yellow Gold Coating has a cubic zirconia clasp.

Source: https://u-treasure.jp/licensor/pocketmonsters