PINK TOURMALINE CATS EYE 5.23 Cts NATURAL SRI LANKA RARE LOOSE GEMSTONE – 20663

100% Natural – Not treated in any way.
Rare Collectors Gem
Suitable for Museums,Institutions and Students of Gemology.
Will make a Gorgeous Ring or Pendent accented with Diamonds.
Beautiful sharp Catseye effect.
Large Sizes are Extremely Rare!
Among the Rarest of gemstones.

Refractive Index:1.624(+.005, -.005) – 1.644(+.006, -.006)
Hardness: 7-7.5
Chemical Comp: (NaCa)(LI,MgFe,Al)9B3Si6(O,OH)31
Density: 3.06 (.05, +.15)
Crystal Group: Hexagonal

Some Tourmalines contain tiny, parallel inclusions, causing them to display a strong chatoyancy and are cut en-cabochon to cats-eyes, which are rare- a collector’s gem. Tourmaline comes from the Singhalese (Sri Lankan) words ‘tura mali’ – gem with several colors. Tourmalines come in a variety of colors, some have two or more colors, some even color-changing.