Genuine Blue Sapphire Necklace with Natural Blue Zircon Halo Genuine White Zircon Starburst Mother-of-ShellIf you want a necklace that will receive compliment, this is it! That's a blue . 55ct center sapphire gemstone stone with a halo of genuine blue zircon, a starburst of white zircon, against a mother of shell background mounted in platinum over . 925 Sterling Silver and filigree edging. The Sapphire is 5mm. The chain is 16 inches. This comes in a teal pendant box. Genuine gemstones.