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Mozambique Rubies

A Mozambique ruby is a ruby from the Montepuez district of Cabo Delgado province in northern Mozambique, a deposit found in 2009 that has become the world's largest source of ruby. The deposit yields both commercial goods and fine unheated stones, and the best of them now compete directly with Burma at auction. Byrex Gems offers Mozambique rubies to the trade from Toronto, filmed unedited in our office, with prices for approved buyers and viewings by appointment.

Where to buy Mozambique rubies in Toronto

Byrex Gems lists 39 Mozambique rubies online today. 31 of them come with a report from laboratories including GRS, GIA and CDC. Viewings are at our Toronto office, 27 Queen Street East, Suite 407, steps from Queen subway station, by appointment. We have supplied coloured gemstones and natural fancy colour diamonds to jewellers and designers since 1988, and welcome private clients by appointment. Prices are shown to approved trade accounts; private clients can ask us on WhatsApp, where we reply within 12 hours, or by email within 24 hours. Every stone ships insured, worldwide.

Among the mozambique rubies listed today: 4.67 ct Oval Ruby, Mozambique Heated, 15.36 ct Cushion Ruby, GIA, Mozambique, 14.73 ct Oval Ruby, GIA, Mozambique Heated, 14.17 ct Oval Ruby, GIA, Mozambique Heated, 13.83 ct Oval Ruby, GIA, Mozambique Heated, 10.56 ct Oval Ruby Pair (5.55 + 5.01 ct), GIA, Mozambique Heated, 9.00 ct Pear Ruby, GRS, Mozambique Heated, 7.11 ct Oval Ruby, Mozambique Heated, 5.18 ct Oval Ruby, GIA, Mozambique Heated, 4.40 ct Emerald Cut Ruby Pair, Mozambique Heated, 4.35 ct Pear/Square Ruby Pair (2.21 + 2.14 ct), GRS, Mozambique Unheated, 4.21 ct Heart Ruby Pair (2.04 + 2.17 ct), GRS, Mozambique Unheated and 27 more.

Where Mozambique rubies come from

Ruby was found near Montepuez in 2009 and the area filled with artisanal diggers within months. In 2011 Gemfields formed Montepuez Ruby Mining with a local partner, holding seventy-five per cent, and began mechanised mining in 2012 on a licence that covers a large tract of the deposit. Its rough is sold at sealed-bid auctions, which has given the market a steady, graded supply for the first time in ruby's history. Fura Gems works a neighbouring licence.

The rubies formed in amphibole-bearing rock rather than marble, so they carry more iron than Mogok stones. That iron calms the fluorescence and gives many Mozambique rubies a slightly deeper or more orangy red, though the best are a pure, saturated red that stands beside Burma. The deposit produces two broad types: cleaner, larger crystals from the secondary gravels that are often unheated, and smaller, more included, strongly coloured material that is usually heated.

Mozambique also yields ruby elsewhere in the north, but Montepuez is the source that matters, and a report stating Mozambique almost always means it.

How laboratories separate Mozambique from Burma

The two origins are separated by chemistry and inclusions. Mozambique rubies contain more iron and show different trace-element ratios from marble-hosted Burma rubies, and their inclusions include amphibole crystals and mica rather than Mogok's calcite and characteristic silk. GIA, GRS, SSEF, Gübelin, Lotus and AGL all state Mozambique as an origin, and the separation from Burma is one of the more reliable calls a laboratory makes.

Origin remains an opinion. Montepuez shares some features with other East African amphibole-hosted deposits, and when the evidence does not point one way a laboratory states the origin as inconclusive. Treatment is the second line to read: many Mozambique rubies are unheated and read "no indications of heating" or, at GRS, "no indication of thermal treatment"; others are heated without residues; the lowest grades of rough are lead-glass filled and must be sold as such.

Pigeon's blood is where laboratories part company. GRS lists Mozambique among the origins eligible for its pigeon blood type, so a Mozambique ruby can carry "vivid red (GRS-type pigeon blood)" if it meets GRS's colour and fluorescence criteria. Gübelin and SSEF require strong fluorescence that higher iron usually suppresses, so they rarely apply the term to Mozambique stones.

What to check before buying a Mozambique ruby

Read the treatment line first, because the same deposit produces unheated, heated and glass-filled material and the three are sold at very different levels. Then look at the colour under incandescent light; a Mozambique ruby will not glow the way a Mogok stone does, and a slight orange or brown cast that is faint in daylight can grow under a warm lamp.

Clarity is the deposit's strength. Eye-clean Mozambique rubies are available in sizes that would be remarkable from Burma, and most are cut in Thailand or Sri Lanka to good proportions, so windows and extinction are less common than in native-cut Burmese goods. Check for fine fractures reaching the surface, which the laboratories will note as fissures and which matter for setting.

Pairs and close matches are more achievable in Mozambique ruby than in any other origin because the supply is steady and graded, though matching fluorescence still takes care. For a pair, insist that both stones share the same treatment status on their reports. At the bench, unheated and heat-only stones take normal handling; keep heat and acids away from anything the report describes as filled.

What drives the value of a Mozambique ruby

Treatment and colour do most of the work. An unheated Mozambique ruby of pure red with no eye-visible inclusions is priced by the same logic as a fine ruby from anywhere, and the best examples have narrowed the gap with Burma faster than any origin before them. Heated stones without residues form the commercial core of the market; glass-filled material is a separate, low-value product.

Size helps more than it does in Burma because the deposit produces clean crystals of several carats, so a five carat clean Mozambique ruby is rare but not unheard of. The GRS pigeon blood designation adds a premium when it appears, and a second report from a Swiss laboratory stating no indications of heating adds confidence for important stones.

Origin itself counts for less than it did. In the deposit's first years Mozambique was priced as a substitute for Burma; the auction results of the last decade, culminating in the Estrela de Fura, have made it a benchmark in its own right.

Estrela de Fura and the market

The Estrela de Fura is the stone that fixed Mozambique's place. Fura Gems recovered a 101 carat crystal at Montepuez and unveiled it in 2022; cut to a 55.22 carat cushion, it was sold at Sotheby's New York in June 2023, taking the auction record for a ruby from the 25.59 carat Burmese Sunrise Ruby. It carried five laboratory reports, from AGL, SSEF, Gübelin, GRS and Bellerophon, all stating Mozambique and no indications of heating.

The wording on those reports is instructive. GRS gave the stone its pigeon blood designation; SSEF and Gübelin described a saturated, homogeneous red without the term, consistent with their fluorescence criteria. Buyers of important Mozambique rubies now expect that pattern and read it correctly.

Supply is the other half of the story. Gemfields has held regular rough auctions since 2014, licensed and artisanal production continues around it, and Mozambique now supplies much of the ruby cut in Bangkok and Sri Lanka. For jewellers that means consistent commercial goods, realistic pairs, and occasional stones that belong in the top tier.

Buying Mozambique rubies from Byrex Gems

Since 1988, Byrex Gems has supplied Mozambique rubies to the jewellery trade from Toronto. The confidence of more than seven thousand trade customers has been earned one stone at a time. Many of our Mozambique rubies come with reports from GRS, SSEF, Gübelin, GIA and other leading laboratories, and each stone is filmed in our office, exactly as it is.

Approved trade buyers see prices online. Everyone else is welcome to write: WhatsApp +1 (437) 450-3786 brings a reply within hours, and an email to info@byrex.com an answer the same day, seven days a week. What is listed is a part of what we hold: more matched pairs and larger Mozambique rubies are kept in the vault, and what we do not hold ourselves we can source through our offices worldwide. We receive clients by appointment in Toronto, Hong Kong, Bangkok and Dubai.

Mozambique Rubies: questions buyers ask

Are Mozambique rubies as good as Burma rubies?

The best are. Mozambique rubies carry more iron, so they fluoresce less, but the finest unheated stones reach a pure saturated red and the current auction record for a ruby belongs to a Mozambique stone. Judge each ruby on its colour, treatment and clarity before origin.

Are Mozambique rubies usually heated?

Both kinds are common. A large share of Montepuez material is sold unheated with reports reading no indications of heating; much commercial material is heated, and low-grade rough is glass filled. Byrex states the treatment line exactly as the laboratory words it on each stone page.

Can a Mozambique ruby be called pigeon's blood?

At GRS, yes: Mozambique is among the origins eligible for its pigeon blood type if the stone meets its colour and fluorescence criteria. Gübelin and SSEF rarely apply the term to Mozambique stones because they require strong fluorescence. Only the report wording counts.

How do laboratories tell Mozambique from Burma ruby?

By trace-element chemistry, especially iron, and by inclusions such as amphibole and mica that do not occur in marble-hosted Burma rubies. The separation is one of the more reliable origin calls, though reports can still state an origin as inconclusive when the evidence is mixed.

Which reports does Byrex supply with Mozambique rubies?

Most carry GRS, SSEF, Gübelin, Lotus or GIA reports, with AGL on some stones. GRS reports are shown on the stone page. For important unheated stones Byrex often holds two reports, and a further report can be arranged on request.

Does Byrex sell Mozambique rubies to private clients?

Yes, by appointment at 27 Queen Street East, Suite 407, Toronto. Private clients see the same stones and reports as the trade; prices are released to approved trade buyers who sign in. Byrex can also source a specific size or pair to a brief.

Can I view Mozambique rubies in Toronto?

Yes. Book an appointment and the stones are laid out for comparison under daylight and incandescent light, with reports beside them. Every ruby is also filmed unedited in our office, so you can study the stone before you visit.

Is a glass-filled Mozambique ruby a real ruby?

It is natural corundum, but its fractures have been filled with lead glass and it must be sold as a treated or composite stone. Laboratories disclose it and GRS codes it H(d). It is priced far below heated or unheated ruby and needs careful handling at the bench.

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