SEDAGEMS

TOURMALINE BIRTHSTONE FOR OCTOBER.

TRIANGLE TUBE CUT

STAMPED 18 K WHITE GOLD PLATED

NATURAL UN HEATED

MINED IN BRAZIL 

GRADING  SI1 

MOHS SCALE 7-7.5

 TOTAL WEIGHT 6.8 CTS

SIZE 21.4X 5.1X5.1 MM

 Tourmaline is a crystal silicate mineral compounded with elements such as aluminium, iron, magnesium, sodium, lithium, or potassium. Tourmaline gem stones come in a wide variety of colors.Tourmaline has a variety of colors. Usually, iron-rich tourmalines are black to bluish-black to deep brown, while magnesium-rich varieties are brown to yellow, and lithium-rich tourmalines are almost any color: blue, green, red, yellow, pink etc. Rarely, it is colorless. Bi-colored and multicolored crystals are common, reflecting variations of fluid chemistry during crystallisation. Crystals may be green at one end and pink at the other, or green on the outside and pink inside: this type is called watermelon tourmaline. Some forms of tourmaline are dichroic, in that they change color when viewed from different directions.