Natural sapphires from Tanzania

Umba Sapphires

Magus Gems offers natural Umba sapphires from northeastern Tanzania as individual loose gemstones. Each available stone is selected and assessed by professional gem cutters.
Shop available Umba sapphires

Currently available

Umba sapphires for sale

View the Umba sapphires currently available from Magus Gems. Each product page presents the individual stone in detail.

A Tanzanian sapphire source

What makes an Umba sapphire distinctive?

Umba sapphires take their name from the Umba Valley in northeastern Tanzania. The area is known for sapphires beyond the classic blue palette, including pink, violet, green, teal and stones with more than one colour.

We examine each sapphire individually, paying close attention to colour, inclusions, orientation, proportions and the way the finished cut handles light.

Colour and light

We assess how the colour appears in different light and how the cut returns that light through the stone.

Cut and proportions

As gem cutters, we consider orientation, facet design and proportions alongside weight and dimensions.

Individual information

Photographs, videos and gemstone details are provided for the specific sapphire you are considering.

Clear information for every stone

Buy an Umba sapphire with confidence

Colour, cut, clarity and proportions all affect the appearance and value of an Umba sapphire. We provide detailed visual and technical information so that each stone can be evaluated on its own merits.

Treatments can exist in Umba sapphires generally. The Umba sapphires offered by Magus Gems are untreated, and treatment information is stated clearly for every individual gemstone.

The Magus Gems perspective

Selected by gem cutters

As professional lapidaries, we look at more than colour alone. We consider how a sapphire has been oriented, how its facets handle light and whether its proportions suit the natural material.

This practical knowledge guides both our selection and the information we share, whether you are choosing a loose Umba sapphire for a bespoke jewel or for a gemstone collection.

Find your Umba sapphire

View the untreated Umba sapphires currently offered by Magus Gems. Availability updates automatically as individual stones are sold or added.

Shop Umba sapphires

A few useful details

Umba sapphire questions

Where do Umba sapphires come from?
They come from the Umba Valley area of northeastern Tanzania, an East African source associated with sapphires in a notably broad range of colours.
Are Umba sapphires untreated?
Treatments can exist in Umba sapphires generally, but the Umba sapphires offered by Magus Gems are untreated. Treatment information is disclosed clearly for each individual gemstone.
Can I buy an Umba sapphire online?
Yes. Each available sapphire has its own product page with detailed photographs, videos, measurements, weight, origin, treatment information and other relevant gemstone details. This helps you evaluate the stone as accurately as possible online. Every gemstone sold by Magus Gems comes with a Certificate of Authenticity.