Vintage ATI THAI Sterling Silver Red Tear Drop Earrings

Older earrings. These are marked 925, ATI, THAI. Sterling silver earrings with a red tear drop. Not sure what the red part of earring is. Could be stone. It has some black veining. These are what I would call blood red color. Approx 1” long. Dainty and delicate wire earrings. Southwestern Western Boho Boho Chic Hippie Gypsy Navajo Sterling Silver Silver 925