History of opal
Opals were greatly valued by ancient monarchs for their protective powers. They were worn as jewelry and in crowns to ward off evil and to protect the wearer's eyesight. The opal was also ingested in a ground-up powder to protect against nightmares.
Science of opal
Opal, which is a "mineraloid" (lacking crystalline structure) has a chemistry of primarily SiO2 (quartz) and includes 5%–10% water. The presence of water in the mineral structure allows geologists to determine the temperature of the rock at the time the opal formed. The structure of opal consists of chains of silicon and oxygen formed within tiny spheres. These spheres are usually inconsistent in size and concentration. In precious opals (the variety used most often in jewelry), however, there are many organized pockets of spheres. The spheres diffract light at various wavelengths, creating beautiful, prismatic colors.                                                                  
An alternate birthstone for October is variety of tourmaline that has transparent elongate crystals, sometimes pink at one end and green at the other. Tourmaline can also be many tones of pink, green, blue, or even black.

Opal - October Birthstone  - Check out the facts and lore of Opals and see a few of the many styles available for purchase or you can create your own style in store with our 3d printing design center. More styles available in store.   

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EARRING INFORMATION                          Item Number 28569
Gemstone : .89TW/DIA        
Diamond Carat Weight : .08tw                        Color Grade :                                           Clarity Grade :                                          Metal :14ky Metal Wgt : 
EARRING INFORMATION                          Item Number 25860                       Gemstone : 4mm Trillion Opal         Diamond Carat Weight :                         Color Grade :                                           Clarity Grade :                                          Metal :14kt yellow    Metal Wgt : 1.2gm
 PENDANT INFORMATION                           item Number 11243                        Gemstone : Floating Opal            Diamond Carat Weight :                    Color Grade :                                            Clarity Grade :                                        Metal : 14kt yellow    Metal Wgt : 1.5gm
 PENDANT INFORMATION                         I  Item Number 11770x                        Gemstone : 5mm Pink Tourmaline          Diamond Carat Weight :                    Color Grade :                                            Clarity Grade :                                        Metal : 14kt yellow    Metal Wgt : 1.5gm
 PENDANT INFORMATION                          Item Number 24296                        Gemstone : 6x4 Pear Opal          Diamond Carat Weight : .02ct                  Color Grade : H                                          Clarity Grade :  SI2                                    Metal : 14kt yellow    Metal Wgt : 1.5gm
 Item Number 24965
Gemstone :Opal/pearl DIA RG          Diamond Carat Weight :
  Color Grade : H                                          Clarity Grade :  SI2                                    Metal :       Metal Wgt :