Bicolor/Party color system
Some gemstones exhibit multiple colors within a single stone; two colors are called bicolor, three colors are tricolor, and multiple colors are called particolor. Some are clearly separated, while others have a gradation, so I think these are gemstones that give you a sense of their individuality.
Karatz GemMagazine
" Bicolor gemstone "
【5/15 22時販売】パープルゾイサイト 2.617ct原石
¥13,800
ウクライナ産バイカラートパーズ 5.622ctルース
¥198,000
ナミビア産ジェレメジェバイト 0.261ctルース
¥69,800
バイカラーサファイア 1.378ctルース
¥98,000
バイカラーサファイア 0.547ctルース
¥15,800
Benitoite 0.066ct loose
¥14,800
Bicolor tourmaline 1.198ct loose
¥14,800