Corundum
Color Zoning

Corundum is the gemstone family that includes sapphire and ruby. Both sapphire and ruby are known to exhibit color zoning, a phenomenon caused by the varying trace elements contained in the sapphire crystal during its growth. Trace elements like titanium are responsible for the fine blue color in this gem. This means that the color is almost never uniform throughout a rough sapphire crystal. The gemstone cutter must plan out his or her cutting expertly, and position the color precisely within the gem, to maximize the sapphire's or ruby's color, brightness, and overall beauty. If the color zoning is unique and aesthetic, as for this one-of-a-kind sapphire, the cutter can position it in the center of the gemstone to give even more personality to the finished piece.

SAPPHIRE
silk inclusions

This fine blue sapphire is colored in part by 'silk', ultra-fine elongated rutile needles that can actually increase the color and saturation within a gem. In this case, the silk gives the sapphire a 'velvety' look, particularly at an arms distance. When the silk threads intersect each other in the perfect orientation, they form a bright 6 or 12 sided star that the lucky wearer can see glowing over the surface of the gemstone.

sapphire
facts & lore
  • It is the birthstone of September.

  • It is believed to protect those close to you from harm and also represents loyalty and trust.

  • Sapphire has a Mohs hardness of 9 out of 10, 10 being the hardness of diamond. This makes it a great gemstone for daily wear in jewelry because it is unlikely to become scratched.

  • Sapphire comes in every color of the rainbow, sometimes with multiple colors in the same gemstone. The most valuable are the vibrant blue sapphires. Another highly valued color is the orangy pink 'padparadscha' color, which represents the color of the Sri Lankan lotus flower.

ruby
facts & lore

This fine blue sapphire is colored in part by 'silk', ultra-fine elongated rutile needles that can actually increase the color and saturation within a gem. In this case, the silk gives the sapphire a 'velvety' look, particularly at an arms distance. When the silk threads intersect each other in the perfect orientation, they form a bright 6 or 12 sided star that the lucky wearer can see glowing over the surface of the gemstone.