Gemini dice have the splendid effect of two colors being swirled together.
Chessex Gemini Poly 7 Set: Black-Shell/White
Chessex Gemini Poly 7 Set: Black-Blue/Gold
Chessex Gemini Poly 7 Set: Black-Green/Gold
Chessex Gemini Poly 7 Set: Black-Purple/Gold
Chessex Gemini Poly 7 Set: Black-Starlight/Red