This is a *natural faceted tricolor watermelon tourmaline from Afghanistan* 🇦🇫

The cushion cut shows a rare color combo: warm champagne/golden brown on top, a soft blush pink band in the middle, and electric green at the base. Most "watermelon" stones are pink+green, so this brown to pink to green zoning is unusual and collectible. Afghan material is known for this kind of sharp color separation.

*Specs you provided:*

- *Weight*: 22.57 carats

- *Dimensions*: 20.18 mm × 12.62 mm × 10.02 mm