Crossword puzzle clue "stone used for some pendants"

a variety of quartz

an amorphous variety of silica

CAMEO, to portray in sharp, delicate relief

LOCKET, a small ornamental case, usually on a necklace or chain, that holds a picture, keepsake, etc.

egg-shaped

ANKH, (Arabic) an Egyptian symbol of life, resembling a looped cross, later adapted by Coptic Christians as their cross

DROP, to let fall in globules