This is a stunning 14K Montana Sapphire Halo necklace with diamond accent stones.. This Montana Sapphire necklace is dainty with stunning diamond accents to truly make it sparkle. The Montana Sapphire measures at 4.07 mm and weighs .32 cts. It’s surrounded by .04cts bright, white diamonds and mounted in 14K white gold. Perfect gift for the September birthday girl! Great for everyday wear. Comes with an 18″ white gold chain.