BTS have released 11 different rings (one is a ring/necklace).

Includes: BTS LightStick Ring, BTS Speak Yourself Ring Set, BTS Purple Gem Ring, BTS Dalmajung Porcelain Ring, Jimin FACE Ring, BTS Monochrome Silver Ring, BTS Monochrome Black Ring, Jimin MUSE Ring, Jung Kook GOLDEN Ring (/Necklace), BTS 2024 Dalmajung Ring Set, j-hope HOPE ON THE STAGE Ring, Jin Japan Tour Ring.

BTS have released quite a few necklaces, of varying types and quality of materials. 

Includes:

BTS have released only a few pairs of earrings, it's not the most common type of merch that they lean towards. However, the earrings they have released are super pretty.

Includes: Jimin Artist Made Earrings.

This includes anything not explicitly known to be jewelry, but that I would categorize as being of similar quality and type of item.

Includes: FESTA 2025 Pocket Watch.