Cubic Zirconia (CZ) 3mm Round Light Yellow Pearl (Synthetic) - 14.5-15 Inch 25x37mm Iron gives them blue

Iron gives them blue

Denim Lapis has the brilliant blue and gold of higher end Lapis

shamans and warriors

is an iridescent composite of organic and inorganic material most known for being the coating of pearls

A mixture of hydrocarbons

Cubic Zirconia (CZ) 3mm Round Light Yellow Pearl (Synthetic) - 14.5-15 Inch 25x37mm Iron gives them blueZircon occurs in a variety of colors including yellow, green, red, reddish brown and blue hues, as well as colorless. Colorless Zircon of the highest quality has been mistaken for Diamond throughout history, and is sometimes referred to as Matara Diamond after the City in Sri Lanka near where the stone is mined.