Sardonyx

Here are the possible Canidates for Sardonyx, from least likely to most likely:

15. Garnet - Pearl Fusion

14. Steven - Garnet Fusion

13. Temple

12. Peridot - Jasper Fusion

11. Onion

10. Rose’s Scabbard

9. Sniffling Croissant 

8. A carton of milk

7. Mr and/or Mrs. Maheswaran

6. The woman at the Movie Theater in Lion 2: The Movie

5. Greg’s van

4. Connie From King of the Hill 

3. Barb

2. The author of the journal, my brother.

1. Nanefua