Radiometric dating is based on what mineral property

Tanzanite is still only found on a few square miles of land in Tanzania, near majestic Mount Kilimanjaro.Its price and availability are directly tied to mines in this region.Tanzanite measures 6.5 to 7 on the Mohs scale of hardness – which is not nearly as hard as the sapphire it often substitutes.Given its vulnerability to scratch during daily wear and abrasion, tanzanite is better suited for earrings and pendants than rings.Initially, d’Souza thought he was mining sapphire, but the crystal was soon identified as a vibrant blue variety of zoisite – a mineral that had been around since the early 1800s. recognized this blue gem’s potential to rival more expensive sapphire, and agreed to become its main distributor.Instead of publicizing “blue zoisite” – which sounded a little too much like “suicide” – Tiffany named the gem tanzanite to highlight its exclusive geographic origin, and introduced it with a promotional campaign in 1968.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.

They notified a prospector named Manuel d’Souza, who promptly registered claims with the government to begin mining.

Buying from a reputable AGS jeweler will ensure that you get what you pay for.

Color, of course, is tanzanite’s most prized trait, especially when it’s deeply saturated blue with violet hues. Tanzanite is pleochroic, which means it displays different colors from different angles.

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.

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