The ring is represented with many parts. You can combine the color of the metal when casting.

Size - 18mmthe width of the shank - 12mm

Weighting:

1. 1459.5527 mm³ Volume
2. 28.17 g Yellow Gold 999
3. 27.03 g Yellow Gold 958
4. 22.67 g Yellow Gold 750
5. 20.32 g Yellow Gold 585
6. 17.14 g Yellow Gold 375
7. 24.0 g White Gold 750 Pd
8. 22.45 g White Gold 750 Ni
9. 21.54 g White Gold 585 Pd
10. 18.76 g White Gold 585 Ni
11. 19.32 g Red Gold 585
12. 16.84 g Red Gold 375
13. 30.21 g Platinum 950
14. 31.44 g Platinum 900
15. 17.75 g Palladium 950
16. 15.12 g Silver 925

the process of making this ring, you can see at the link https://www.youtube.com/watch?v=AzhC_fG4Ndw