Violetish Blue Tanzanite Oval 4.7 ct

Tanzanite is a blue to violet variety of mineral Ziosite.

It belongs to orthorhombic crystal system and was discovered in 1967 in the foothills of Mount Kilimanjaro which remains the only commercial source to this day. Tanzanite is strongly trichroic while unheated and will appear blue, pink or yellowish depending on orientation of the crystal. Most tanzanites; however, are found in colour which requires improvement through heating that drives the yellow component out. Resulting stones are dichroic blue-violet. This optical property makes a proper orientation of the rough material for cutting very important, to show the best hue facing up. In any case, tanzanite always shows more purple under incandescent light and more blue in a daylight.

Violetish blue is considered the top colour

but the most important pricing factor is actually saturation. There is a huge difference between pale commercial stones and unique, vivid inky gems. Classified as a Type I gemstone tanzanite is expected to be eye-flawless if rated VVS. With a 6.5 hardness, Tanzanite is a bit softer than Quartz that is a common component of dust and soil. It is also relatively brittle so normally used for pendants, earrings or cocktail rings. For cleaning we recommend a soft brush or a cloth and a running water to remove the dirt without causing unnecessary abrasion.