Zodiac Wheel Astrological Symbols Sterling Silver Celtic Knot and Rainbow Moonstone Ring(Sizes 4,5,6,7,8,9,10,11) 6mm Round Genuine Rainbow Moonstone (natural inclusions and fractures that reflect light) 7/16" Wide in the Center 3mm Wide on Bottom Weight is 4 to 4.5 Grams Nickel Free Silver and Marked .925