Hunza Ruby: Yaqoot From the Marble of the Karakoram ہنزہ کا یاقوت

Where Hunza ruby is found

The Hunza valley runs north from Gilgit along the Karakoram Highway towards the Khunjerab Pass. Ruby workings are found on the valley sides around central Hunza and neighbouring Nagar, often high above the river, reached by steep paths. Many are small tunnels or open cuts that follow a band of marble across the slope.

Rough and specimens are traded locally in towns such as Aliabad and Karimabad, in Gilgit, and further south in Peshawar.

The geology in plain words

Ruby is red corundum, an aluminium oxide coloured by chromium. To form, it needs plenty of aluminium and very little silica, because silica would combine with the aluminium to make other minerals first.

In Hunza, old limestone and impure sediments were buried deep and cooked during the collision that raised the Karakoram, turning them into marble. Pockets of aluminium-rich, silica-poor material inside that marble crystallised as ruby, with chromium providing the colour. This is the same broad type of deposit as the classic marble-hosted rubies of other parts of Asia, which is why Hunza crystals often look similar in shape and setting.

The marble also hosts spinel, along with micas, pargasite and other minerals that collectors prize. Blue to purple sapphire turns up occasionally too.

A short history

Ruby in Hunza was known locally for generations, and the deposits became more widely known after the Karakoram Highway opened the valley to easier travel in the later twentieth century. Since then, Hunza has been a steady source of ruby specimens and cabochon material. Mining has always been small-scale and largely seasonal, with work slowing in the cold months.

The valley's name has since become a familiar label in the mineral specimen trade. Good ruby crystals still sitting in white marble are sought by collectors, and a fine specimen can be worth more left whole than cut into cabochons.

We do not quote production figures. They are not reliably recorded for small workings, and estimates in circulation should be treated with caution.

What Hunza ruby looks like

• Colour: pink-red to purplish red, sometimes a strong raspberry tone. Stones with a pure, deep red are less common.
• Transparency: mostly translucent to nearly opaque. Fine transparent faceting material is rare.
• Crystal form: flat, six-sided barrels and tablets, often set in white marble with mica.
• Glow: marble-hosted rubies are often low in iron, so many show a lively red fluorescence in sunlight, which helps their colour.
• Inclusions: fractures, cloudy zones and fine needles are common.

Because of this, much Hunza ruby is cut as cabochons or beads, and the finest pieces are often kept as crystals in matrix rather than cut at all.

How Hunza compares with other rubies

These are general tendencies. Origin cannot be told by eye, and a pink-red ruby could come from many places. See our ruby guide for more on colour and treatment.

How origin is proven, and how it is not

A seller's word, a stone's colour or the fact that it was bought in Gilgit does not prove Hunza origin. Ruby and spinel move through the same bazaars as material from Afghanistan and further afield.

A gem laboratory can sometimes offer an origin opinion for ruby based on inclusions and trace elements. That opinion is most useful for better, transparent stones, where the cost of the report is small compared with the value. For a Hunza cabochon, a report that confirms natural ruby and describes any treatment is usually the sensible choice.

A crystal still in its white marble is more convincing evidence of a marble-hosted source than a loose cut stone, but it is still not proof of a particular valley.

Treatment, filling and look-alikes

Ask first whether a ruby has been heated or glass-filled. Glass-filled ruby is heavily treated material that can look attractive at a low price but needs careful handling; it should always be disclosed. Spinel and garnet can also be mistaken for ruby, and spinel from Hunza is a fine stone in its own right. Read how to identify an original ruby and reading a ruby.

Buying Hunza ruby: practical advice

1. Decide what you want. A specimen in marble, a cabochon for a ring and a faceted stone are three different purchases with different prices.
2. Judge colour in daylight. Hunza ruby's glow is strongest in natural light; tube lighting can make it look flat or purplish.
3. Accept translucency, not cracks. A milky look is normal for Hunza material; deep fractures that reach the surface are a durability risk.
4. Ask which ratti. The standard gem ratti is 0.91 carat; the jeweller's ratti is about 0.61 carat. Use the carat to ratti converter to compare quotes.
5. Get treatment in writing. Especially for any stone sold as unheated.

Hunza spinel and the other marble stones

The marble that carries Hunza ruby also gives spinel in red, pink, purple and sometimes blue tones. For a long time spinel was sold as ruby in many markets, and some of history's famous "rubies" have turned out to be spinel. Today spinel is valued as a gem in its own right: it is hard, usually untreated and often bright. If a Hunza "ruby" seems unusually clean and well priced, ask whether it might be spinel, and have it tested if the price is significant.

Other minerals from the same rocks, such as green pargasite and golden mica, are mostly of interest to collectors and appear on specimens alongside the ruby crystals.

Caring for ruby

Untreated and heated ruby are among the toughest gemstones, so a solid Hunza cabochon wears well in a ring. Clean it with warm soapy water and a soft brush. Glass-filled ruby is different: keep it away from heat, jewellery repair torches, acids and ultrasonic cleaners, because the filling can be damaged. Translucent stones with surface-reaching fractures also deserve a protective setting. See how to care for gemstones.

Ruby prices

Ruby price is driven by colour, transparency, size and treatment, then by origin when it is supported. Translucent Hunza material is usually far more affordable than transparent faceted ruby. The table below comes from our own ruby listings and is refreshed monthly.

Ruby at GemStore

Our current ruby listings are not sold as Hunza ruby; examples include this 2.55 carat Madagascar ruby and this 3.40 carat natural ruby. If you are looking for Pakistani ruby specifically, message us on WhatsApp and we will tell you honestly what we can source. Browse all rubies and spinel, or see lab-certified ruby.