Approx. 1 ¼ x 1 1/2 long 50 cts High Flash Moonstone & Black Tourmaline. Rough Slices of Flashy Moonstone with Black Tourmaline Earrings Collection. This pair of earrings of large off-round moonstones is very light to wear but pack a big flashy-punch of gemstone. The slices of moonstone with their natural black tourmaline matrix is a go-with-everything earring, easy to wear for a high impact everyday – or flattering flash of blue and silver for that evening event. All prong-set with sterling silver.