How to Buy Tanzanite
There are many motivations to buy tanzanite, whether to celebrate a December birthday, to commemorate a 24th wedding anniversary, or simply to enjoy the gem’s rare, vibrant blue. It even serves as a less expensive substitute for sapphire.
Most tanzanite on the market today gets its blue color from heat treatment, which minimizes the stone’s natural brown hues. Treated tanzanite has become the norm, so although it’s undetectable, it’s usually assumed.
Color, of course, is tanzanite’s most prized trait, especially when it’s deeply saturated blue with violet hues. Paler shades are less expensive.
Tanzanite is pleochroic, which means it displays different colors from different angles. So the cut significantly influences the color, which determines the price. Cutting a stone to emphasize the blue may waste more of the rough, but because this color is more valuable than violet, the cutter may choose a small fine-colored blue gem over a larger violet one.
Most faceted tanzanite weighs less than five carats. Stones heavier than 50 carats are rare, although The Smithsonian Institution’s collection includes a faceted 122.7-carat tanzanite. The world’s largest rough tanzanite weighed 16,839 carats.
Because tanzanite is only found within a few square miles in Tanzania, its price and availability can fluctuate sharply, depending what happens there.
Although it doesn’t have a long history of admiration like some gems, tanzanite didn’t take long to rise the ranks. Between its exclusive origin, finite supply and intense blue beauty, tanzanite continues to grow in popularity.