This matched pair are fossil trilobites from House Range-Antelope Springs in Millard County Utah in the U.S.A.
SIZE:(in millimeters) 20 x 15 x 2.5 to 3 MM THICK EACH STONE.
WEIGHT(Carats): 19 TOTAL WEIGHT OF BOTH STONES.
DOME: NATURAL FOSSIL.
BOTTOM: NATURAL NOT CUT.
EDGE: NATURAL NOT CUT.
POLISH: NATURAL NOT CUT