Rebecca Zemans Jewelry Blog — heat treatment

Tanzanite is a beautiful blue-violet crystal and is one of the birthstones for the month of December.  The blue color appears stronger under fluorescent light and the violet hues are more apparent when under incandescent lighting.  The mineral was first discovered in the Mererani Hills of northern Tanzania near Mount Kilimanjaro in 1967 and is extremely rare to find outside this region.  The mineral was named by Tiffany & Co in a campaign advertising that tanzanite could now be found in two places: "Tanzania and at Tiffany's". The tanzanite is predominantly blue gemstone, and is an affordable alternative to sapphire for...

The word ruby comes from the Latin word "ruber" which means red. The ruby is a red variety of the mineral Corundum, which is one of the hardest minerals known to us and is found in metamorphic rock. Unless the gem is the color red, which it gets from traces of chromium, it is considered a sapphire. The ruby stands for heat and power and was often used as bullets for blowguns, to heat water or as a cure for indigestion. The ruby, which in Sanskrit is called "ratnaraj" meaning "King of Gemstones", was in ancient Indian thought to protect against misfortune...