Musgravite Price per Carat: Ranges, Rarity and How to Buy

Musgravite is one of the most expensive gemstones sold by the carat, but there is no public price index for it. Dealer and auction guides put typical faceted stones at about US$30,000 to US$35,000 per carat, with weak or small stones from about US$6,000 and one reported sale of a 16.05 ct stone at about US$49,800 per carat (Gemrock Auctions gemstone encyclopedia, updated January 2026). Wikipedia quotes roughly US$35,000 per carat. Treat every figure as an asking-price range, because only a small number of gem-quality stones are known (about 20 faceted stones by 2006, per Gemrock Auctions).

This guide gives the price ranges with their sources, then explains why the stone is so scarce, where it is found, how a laboratory proves that a stone is musgravite and not its look-alike taaffeite, and how to buy one without being fooled. A calculator turns your own stone weight and price per carat into a value range.

Musgravite price per carat: what dealer and auction guides show

A carat is 0.2 gram, the unit gemstones are priced in. Because musgravite so rarely reaches the market, published prices come from dealer guides and a handful of reported sales, not from a trade price list like the ones used for diamonds. The table lists the ranges we found, with the source and what each number really is.

The spread between US$6,000 and US$49,800 is the first thing to notice. It shows that one stone’s price depends on its own colour, clarity, size and paperwork, so a single “price per carat” number says little. A buyer needs to see the individual stone and its laboratory report.

Musgravite price compared with diamond and taaffeite

Gemrock Auctions puts a 1 ct white diamond at roughly US$1,300 to US$16,500, with most between US$4,400 and US$7,600, and quotes tanzanite at about US$1,200 per carat on average. The same encyclopedia puts taaffeite, the closest relative of musgravite, at US$1,500 to US$2,500 per carat on average, with a top grade of up to US$35,000. The chart below sets the typical ranges side by side. These are guide ranges for faceted stones, not records of completed sales.

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Guide price ranges per carat

US$ per carat, typical ranges from one dealer guide

What sets the price of one musgravite

Six factors decide where a stone falls in the range. Gemrock Auctions names rarity, colour, cut, clarity and carat weight as the main value drivers, and says purple is the most valuable colour, while colourless and red stones are rarer than the common grey-green to olive stones.

• Colour. Grey-green to olive is the usual colour, and iron is the likely cause of green. Purple, violet and red are scarcer and priced higher.
• Clarity. Clean, transparent stones command the most. Known inclusions include apatite crystals, fine needles and black graphite plates, and a 2005 study of Sri Lankan stones found spinel, graphite and magnesite inclusions.
• Size. Most stones are under 5 ct. The price per carat rises sharply for large stones, as the reported US$800,000 sale of a 16.05 ct stone shows.
• Cut. Almost all stones are faceted, usually as cushion, oval or pear shapes, to keep the weight and colour.
• Identification. A stone sold as musgravite without a laboratory report is a risk, because taaffeite looks the same to the eye.
• Origin and provenance. Sri Lankan and Tanzanian stones are the usual gem sources; a documented origin helps resale.

How rare is musgravite

Musgravite is very rare, and the counts are small enough to list. The mineral was discovered in 1967 in the Musgrave Range of South Australia. A Canadian mineral-trade article states that facet-grade stones were not reported until 1993 and that only eight specimens were known by 2005 (Multicolour gemstone guide). Gemrock Auctions reports about 20 faceted stones confirmed by 2006 and says known sources yield no more than 5 to 10 gems a year. The two sources count different things, so we show both without trying to reconcile them.

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How few musgravites are known

Number of stones, as counted by two sources

Dealer guides therefore agree on the order of magnitude: a few new cut stones a year at most. No registry or customs figure exists, so nobody can say how many stones have been cut in total. One reason for the confusion is that musgravite and taaffeite look alike. The same Multicolour guide reports that checks on Tunduru, Tanzania, material found musgravite in 10% to 15% of stones that owners had sold as taaffeite.

Where musgravite is found

The type locality, the place where the mineral was first described, is the Ernabella Mission area in the Musgrave Ranges of South Australia, and the mineral takes its name from the ranges (Wikipedia). Webmineral places the original find about 16 km north-northeast of Ernabella. The other known occurrences are listed below, with what the sources actually say about each.

• Sri Lanka. Four transparent gem-quality musgravites studied by Schmetzer and co-authors in 2005 came from the island’s secondary (alluvial) gem gravels, the first data for stones from there (Neues Jahrbuch fuer Mineralogie, 2005).
• Tanzania. The Tunduru gem gravels are named as a source in the Multicolour guide.
• Greenland. A 1993 paper in Mineralogical Magazine describes vitreous black crystals under 7 mm in calcite marble at Dove Bugt, North-East Greenland. These are mineral specimens, not cut gems.
• Antarctica. The same paper notes a second high-grade terrain with musgravite in Antarctica.
• Madagascar and Myanmar. Both appear in dealer guides as small sources. We found no mine, deposit report or production figure for either, so treat them as occurrence records.

How musgravite forms

Musgravite needs beryllium, magnesium and aluminium in the same rock, and beryllium is rare in the crust. Webmineral describes the original Australian find as a nodule, perhaps once a corundum crystal, inside high-grade metamorphic rocks (metapyroxenite, metaperidotite and granulite). The Greenland paper says the beryllium source is uncertain in each occurrence and favours beryllium carried in by fluids linked to granite for the Greenland case. The Sri Lankan study reads the inclusions as pointing to two settings: high-grade metamorphic rock for stones with spinel lamellae, and magnesian skarn (a lime-rich rock altered by hot fluids) for stones with graphite and magnesite.

The practical lesson for explorers is that musgravite is a by-product of finding the right rock, not a target of its own. It has been found in alluvial gravels, so it is concentrated by weathering and river transport after it leaves the host rock.

Musgravite properties and how labs identify it

Musgravite is a beryllium-magnesium-aluminium oxide, written (Mg,Fe,Zn)₂BeAl₆O₁₂, in the trigonal crystal system. The IMA-approved name is magnesiotaaffeite-6N’3S (approved 2002, per Webmineral), but the trade still calls it musgravite. Taaffeite is hexagonal; musgravite is trigonal.

The refractive index (how much the stone bends light) differs between sources, and Schmetzer and co-authors link it to the iron and zinc content, so a single fixed number does not exist. Dealers also report that the stone has a cleavage direction, so it can chip under a hard knock even though it is hard to scratch. Ask a jeweller to set it in a protective mount.

Gemmologists cannot separate musgravite from taaffeite reliably by eye or by a simple refractometer. The 2005 Sri Lankan study used Raman spectroscopy (a laser method that reads a mineral’s vibrations) and electron microprobe analysis (a beam that measures composition). A 2024 GIA note confirmed a musgravite crystal inside a 6.59 ct green sapphire with Raman as well. A claim of musgravite with no instrument test behind it should not be trusted.

Musgravite vs taaffeite

Taaffeite (BeMgAl₄O₈) is the family namesake. Richard Taaffe found the first sample in October 1945 in a Dublin jeweller’s shop, which makes it the only gemstone first identified from a cut stone (Wikipedia). The two minerals share hardness (8 to 8.5) and a similar look, but taaffeite is hexagonal, musgravite is trigonal, and the musgravite formula allows iron and zinc in place of magnesium. The price gap is large: typical taaffeite is quoted in the low thousands of dollars per carat, typical musgravite in the tens of thousands.

The largest cut musgravites

Large stones are the exception. The Gemrock Auctions encyclopedia lists the 22.64 ct Ophir Musgravite, the 21.07 ct Ophir Red Musgravite and the 16.05 ct grey-purple heart-shaped stone from Sri Lanka as the leading cut stones after the 214 ct Ophir Grand Musgravite. The 214 ct figure rests on dealer pages alone, so we leave it out of the chart. A 0.85 ct stone studied by GIA in 2015 is the only known musgravite to show an optical effect, a thin-film iridescence caused by aligned etch tubes (per Gemrock Auctions).

Chart

Largest cut musgravites

Carats, stones named in one dealer guide

Musgravite jewelry and rings: what to expect

Musgravite rings and pendants are made to order, because a jeweller needs a stone first. Stones are mostly small, so a ring usually carries a single faceted gem under 5 ct in a protective setting such as a bezel, which wraps the edge in metal. Hardness of 8 to 8.5 means the stone resists scratching in daily wear, better than most coloured stones, but dealers report a cleavage, a direction along which it can split, so a hard knock on a prong can chip it. Gemrock Auctions advises cleaning with a soft brush, lukewarm water and mild soap.

Because the stone is so rare, many jewellers have never set one. Ask the setter whether they have worked with taaffeite-family stones, and have the stone weighed and photographed before and after. Keep the laboratory report: when the stone is later sold, the report is what proves the species.

A worked price example

Suppose a 2 ct grey-green stone is offered at US$30,000 per carat. The asking price is US$60,000. If the seller accepts 10% less, the cost is US$54,000. A 16.05 ct stone that sold for US$800,000 works out at about US$49,800 per carat (Gemrock Auctions), so the larger stone fetched well above the typical range per carat. The figures are examples; use the calculator in the price section to test your own numbers, and always compare against a report-backed stone.

Where musgravite is sold

Stones reach buyers through specialist rare-gem dealers, gem auctions and private sales between collectors. Mainstream jewellery shops rarely stock it. Online marketplaces list many items labelled musgravite, and those need the most care: without a laboratory report there is no proof of the species, and cheap items are likely to be other minerals. A seller who cannot name the origin or provide a report should be treated as an unknown.

How to buy musgravite without being fooled: 6 steps

1. Ask for a laboratory report. It must name the species by instrument test (Raman or microprobe), not just “taaffeite family”. Names to look for are GIA, Gubelin and SSEF.
2. Check the weight and colour on the report against the stone, and ask for photographs in daylight and under a lamp.
3. Ask where the stone was mined and whether the seller has a record. Sri Lanka and Tanzania are the main gem sources named in dealer guides.
4. Compare a price per carat with the ranges above. A “musgravite” priced at a few hundred dollars per carat is almost certainly something else.
5. Ask about treatment. The report should say whether the stone is natural and untreated.
6. Get insurance and a written return window. Keep the report with the stone; it is part of the value.

Do not rely on online listings with no report. Resale is thin, because few buyers know the stone, so the paperwork matters as much as the gem.

Musgravite meaning and symbolism

Musgravite was first described in 1967, so its “meaning” is modern. Gemrock Auctions describes the green stone as a symbol of joy, new beginnings, balance and growth, and purple stones as wisdom. These are beliefs of crystal sellers, not findings of science, and they play no part in pricing. If you buy for meaning, the real story is the rarity and the fact that the stone is named for the place where it was found.

Is musgravite an investment?

This page is not investment advice. Facts that matter to a buyer: there is no price index, no exchange and no published sales history, only dealer asking prices and a few reported sales. No source gives a price history or growth rate. A stone that is hard to sell back, hard to value and easy to confuse with taaffeite is a collector’s purchase first. Anyone considering one for wealth should get an independent valuation from a gemmological laboratory or auction house and price in the cost of selling.

How explorers look for rare gem minerals

No satellite can see a musgravite crystal. The crystals are millimetres to centimetres across, hidden in rock or river gravel. What imagery can do is help with the groundwork: mapping rock types and structure, locating the river systems that carry gem gravels, and checking land and access before a field party goes in. In Sri Lanka and Tanzania the gem sources are alluvial gravels, so the work is closer to placer prospecting than to hard-rock mining. For a general guide to searching for gem host rocks, see our post on diamond exploration from indicator grains to kimberlite pipes, and for other rare stones see painite price per carat and the rarest minerals.

Farmonaut’s Mining service takes a KML, KMZ or polygon of a licence area and returns a satellite-based screen of target zones, which gives a team a map before it spends on field work. It does not locate individual gems. Provenance records for gems and minerals can be supported with a product traceability record, and mine operators can estimate their environmental footprint with carbon footprinting tools. Alluvial gem pits need the landowner’s permission, the right licence from the local regulator, and safe practice. Never use mercury.

▶ Explains remote sensing for mining in plain words: what satellites measure and how that helps narrow a search area. · 2:01

How we chose these figures

We used only sources we could open. Mineral facts come from a peer-reviewed paper (Mineralogical Magazine, 1993), a mineralogy journal abstract (Neues Jahrbuch fuer Mineralogie, 2005), a GIA note (Gems & Gemology, 2024), Wikipedia and Webmineral. Prices come from two dealer and auction guides, Gemrock Auctions (updated January 2026) and Jeweler’s Touch, because no laboratory or auction house publishes a musgravite price series. Where sources disagree, such as the number of known stones and the refractive index, we show both and say so. We left out the 214 ct stone and the Madagascar claims because only dealer pages support them. We found no 2026 sales data for musgravite on 26 October 2026, so the ranges above are guide prices, not market quotes.

Frequently asked questions

How much is musgravite worth per carat?

Dealer guides put most faceted stones at about US$30,000 to US$35,000 per carat, with weak stones from about US$6,000 (Gemrock Auctions, updated January 2026). A 16.05 ct stone is reported by Gemrock Auctions alone to have sold for US$800,000.

Why is musgravite so expensive?

Very few gem-quality stones exist: about 20 cut stones had been confirmed by 2006, and known sources give no more than 5 to 10 gems a year, per one dealer guide. Buyers compete for a tiny supply.

Is musgravite rarer than diamond?

By the number of cut stones, yes. Diamonds are mined in large volumes every year, while musgravite is counted in individual stones.

What colour is musgravite?

Usually grey-green to olive; it can also be grey-purple, violet or nearly colourless, and red is rare. Purple stones are the most valuable (Gemrock Auctions).

Where is musgravite found?

It was first found in the Musgrave Range, South Australia, in 1967. Cut stones have come mainly from Sri Lanka and Tanzania, and the mineral has also been recorded in Greenland, Antarctica and other places.

What is the difference between musgravite and taaffeite?

They share a hardness of 8 to 8.5. Taaffeite is hexagonal and musgravite is trigonal, and the musgravite formula allows iron and zinc. A laboratory needs an instrument test to tell them apart.

What is musgravite’s real name?

The mineral name approved by the IMA is magnesiotaaffeite-6N’3S. “Musgravite” is the older name and the one used in the gem trade.

How hard is musgravite?

It is 8 to 8.5 on the Mohs scale, harder than beryl, but dealers report a cleavage that makes it chip under a sharp blow.

Can I buy musgravite jewelry?

Yes, but supply is very thin. Stones are usually under 5 ct and sold through specialist dealers and auctions. Ask for a report that confirms the species.

Does musgravite have a meaning?

Crystal sellers link green musgravite with joy and new beginnings. That is a modern belief with no scientific basis.

Can satellites find musgravite?

No. A satellite can map rock types, structure and river systems, which helps narrow a search area, but it cannot see millimetre-size crystals.

Where does the name musgravite come from?

From the Musgrave Range in South Australia, where the mineral was first found (Wikipedia).