1.70 Ct. Violetish Blue Tanzanite from Tanzania

Born from a singular slice of Earth where fire and pressure conspired over millennia, this tanzanite speaks first of place, the Merelani Hills of northern Tanzania where this gem species was discovered less than a century ago and nowhere else on the planet produces its like. At The Natural Gemstone Company we trace each gem back to its origin, and this transparent 1.70 carat round violetish blue tanzanite carries with it the memory of Tanzanian blue soil, the hands of miners who bring rough crystals to light, and the quiet, ancient geology that made its color possible. When you hold this stone you are touching more than weight and measurement, you are touching a story. The dimensions are exact, 7.52 x 7.42 x 4.61 mm, a compact and perfectly proportioned parcel of color that has been enhanced through careful heat treatment to reveal a vivid violetish blue that seems both ocean deep and twilight bright. Its clarity was assessed at eye level as very very slightly included, meaning the gem reads as remarkably clean to the naked eye, and its excellent polish allows each facet to sing with reflected light.

The journey from rough crystal to this finished round mixed brilliant cut is one of patient decision, skilled hands, and an eye for maximizing the natural virtues of the material. We chose a mixed brilliant cut because it balances scintillation and depth, the crown facets inviting lively sparks under direct light while the pavilion facets deepen the violet and blue tones so prized in tanzanite. The cutter took into account the stone dimensions and internal features, orienting the pavilion to respect the pleochroic nature of zoisite material, so that as the stone moves it reveals subtle shifts between richer blue and cooler violet, a trait that makes tanzanite so mesmerising. Heat treatment was applied in a controlled way to transform the stone from its more muted rough state into the vivid color you see now, a standard and stable enhancement that unlocks the gem s finest expression without compromising its integrity. With very very slight inclusions only apparent under magnification and an excellent polish, the finished gem offers clean, lively light performance ideal for a central setting.

This tanzanite also carries heritage, because although the gem itself is a modern discovery it inherits the long cultural language of blue and violet stones in human history. Across civilizations blue gems have symbolised wisdom, authority, and inner calm, from the lapis adornments of ancient Egypt, to the sapphire set into crowns and rings that marked vows and office. Jewelry makers and wearers have long associated deep blue and violet stones with clarity of thought and emotional balance, and this tanzanite sits comfortably within that tradition while bringing a distinctly East African provenance to that lineage. In Tanzania the arrival of tanzanite in the global market brought new livelihoods, and at The Natural Gemstone Company we respect that connection between stone and community, working to document origin and to support transparent practices where possible. When set into a ring, pendant, or brooch this gem carries those layered stories, it becomes both a modern treasure and a contemporary chapter in a long human relationship with colored stone.

Imagine this stone at the heart of a bespoke piece, a solitary round center flanked by white diamonds to heighten the blue, set in warm 18 karat yellow gold to amplify the violet hues, or in cool platinum to let the blue read as pure and crisp. Its 1.70 carat weight and 7.52 x 7.42 x 4.61 mm proportions suit a variety of designs, from a classic engagement solitaire to a modern pendant that allows the gem to move and display its pleochroism. Tanzanite is beautiful and also requires thoughtful care, because while durable for everyday occasional wear it is not as hard as sapphire or diamond, so avoid hard knocks, extreme heat shock, and harsh chemicals, clean with lukewarm soapy water and a soft brush, and consult with our team at The Natural Gemstone Company about settings that protect the girdle and pavilion for everyday life. If you would like further photographs, custom mounting options, or a detailed origin certificate for this specific 1.70 carat round violetish blue tanzanite, contact us and we will guide you through design options, secure packaging, and certification, so that this small parcel of Tanzanian geology becomes a treasured heirloom in your personal story.