Details Judy Geib 18k yellow gold & double dendritic agate necklace with pink tourmaline & tanzanite. The larger agate measures approximately 2" x 1 3/4" & is surrounded by four tanzanite stones. the two stones are attached to a handmade 18k gold chain and the total length of the necklace measures 17 3/4". - dendritic agate - pink tourmaline, 25.3ct - tanzanite, 29.9ct - 18k yellow gold - 17 3/4" total length