GEM: 1.8 x 1.8 x 1.4 cm (25.5 carats) I love this set because its a rare instance to match the significance in both specimen and gem! The specimen is a superb example for this classic locale because it is large, complete, and very well colored. the gem is HUGE for what it is unusually clean, and is said to be by those who know more than I one of the best cut Mexican apatites. It is very impressive in person and look smor elike fluorite, for the color and clarity - you would not guess aapatite at first. And yet, the colors here are a dead-even match and I know the man who cut it. BOTH STONES ARE MORE GREEN In PERSON< THAN YELLOW AS THEY APPEAR.