
Tanzanite Unheated Engagement Ring
A Unique Violet Shade for Your Custom Jewellery
This engagement ring was built around an unheated tanzanite, designed with the couple. Tanzanite is the blue-violet variety of the mineral zoisite, found only in northern Tanzania. This stone was left untreated, so instead of the strong blue-violet of heated tanzanite it holds a softer greyish violet. It is set in rose gold, which warms the cool colour.
Heat Treatment in Tanzanite
Almost all tanzanite is heated. Most rough comes out of the ground brown, and a controlled heat of around 550 degrees brings out the blue and violet. It is a standard, stable treatment, and a fine heated tanzanite can look close to a vivid blue sapphire. Unheated tanzanite, still in the colour it was mined in, is genuinely uncommon, and collectors value it for that.
While it may not exhibit the vibrant blue-violet of heat-treated tanzanite, which is common for many tanzanite that you see in many retailers. Unheated tanzanite presents a more subdued and unique aesthetic, making it a distinctive choice for gemstone engagement rings.
Unique Subtle Elegance in unheated Tanzanite
Unheated tanzanite reads as a soft greyish-violet rather than a saturated blue. It is a quieter stone, and the people who choose it usually want exactly that: a colour that is clearly not sapphire, and a stone that has not been treated.

Tanzanite or Sapphire?
At GIOIA Fine Jewellery, we designed this engagement ring consists of side diamonds set beside the main Tanzanite. The couple who opted for this customised design spent time discussing the fine details of their once in a lifetime and memorable event of their life. The gentleman tweaked the design a bit to have additional diamonds set on the sideband underneath the Tanzanite. This stunning colourful Tanzanite unheated engagement ring is both classically elegant and eye-catching. Lively in colour, this tanzanite ring is surely going to attract a lot of curious onlookers.
When searching for a customised gemstone engagement ring sapphire alternative, tanzanite is undoubtedly one of the closest options available. However, one key factor: tanzanite is 6 to 7 on the Mohs scale, softer than sapphire and with a cleavage plane, so it is more vulnerable to chips and scratches. This is one of a critical factor especially if you are looking for an engagement ring which will be worn for a lifetime.
When selecting a sapphire, it’s always recommended to prioritise its vivid blue hue, as this is one of the gemstone’s defining features. While tanzanite may appear similar in colour, it typically carries a slightly more violet tint, which sets it apart from the rich blue of sapphire. Which is always good to compare them in actual side by side for their colour saturation and shade.

Common Questions
Is unheated tanzanite worth more than heated?
Not always, and it depends on the stone. A naturally blue unheated tanzanite is rare and carries a premium. An unheated stone in the more common greyish-violet is priced for that colour rather than for being untreated. What you are paying for either way is the colour in front of you.
Can tanzanite really be an engagement ring stone?
Yes, with a setting that protects it and a little care in wear. Tanzanite is softer than sapphire, so we favour a bezel or a low halo, and we would suggest taking the ring off for sport or heavy work. For a ring that never has to be thought about, sapphire is the harder-wearing choice.
Discover the perfect tanzanite unheated engagement ring at GIOIA Fine Jewellery now. Where we offer an exquisite selection of gemstones like sapphire, ruby, emerald, and Paraiba tourmaline. Each one is ethically sourced and chosen by hand. Whether you’re looking for a specific hue or within a particular budget, visiting us in person will allow you to see and feel the unique qualities of each stone. Book an appointment today to explore our wide gemstone collection and create a personalised engagement ring or wedding band that perfectly reflects your love.

