A collector's guide to Jaquetô mine, Brazil: its geology, mining history and notable minerals, illustrated with the 36 specimens documented from this locality on EarthWonders.
Key facts
Jaquetô is one of those Brazilian pegmatite names that became collector shorthand for a look: water-clear to sea-blue-green aquamarine, commonly as etched, lustrous floaters whose outlines are more sculpted than textbook-simple. The mine is placed by current locality databases at Guaratinga, Bahia, in Brazil’s Northeast Region, although older specimen labels and literature may spell it Jaqueto or Jaquetó and may associate the area with Medeiros Neto or the broader southeastern Bahia gem fields. Its reputation rests above all on aquamarine and beryl from granitic pegmatite workings, with a historically important chrysoberyl–alexandrite association in the same southern Bahia gem province.
The best Jaquetô aquamarines are not just blue beryl crystals; they are classic gem-crystal objects. Collectors prize the stout “barrel” crystals, elongated tapering prisms, and etched “icicle” forms whose corrosion surfaces can turn a simple hexagonal prism into a glittering architecture of re-entrant faces and stepped terminations. Good pieces show an unusually clean body, pale to richer blue-green color, high luster, and completeness all around; the most desirable are floaters or near-floaters that preserve the gemmy central “nodule” that would otherwise have tempted a cutter.
Regional View
Country View
Jaquetô belongs to the long Brazilian tradition in which gem rough and mineral specimens competed from the moment a pocket was opened. The finest aquamarines from here are so transparent and so evenly colored that many potential specimens were almost certainly cut, and that is part of why intact, undamaged crystals with old provenance have acquired a classic status well beyond their size.
Photo: Wikimedia Commons / Rob Lavinsky, iRocks.com
Search for specimens: View all specimens from Jaquetô mine, Brazil
The Jaquetô mine is a gem pegmatite locality in Guaratinga, Bahia, in the southeastern gem belt of the state. Regional geological summaries for this part of Bahia emphasize granitoids and pegmatitic bodies that carry aquamarine, beryl, chrysoberyl and alexandrite, with the broader southeastern Bahia setting lying near the transition between the São Francisco craton and the coastal mobile belt. The locality is not one of the great lithium-phosphate pegmatites of Minas Gerais; its collector identity is narrower and cleaner: Be-bearing pegmatite mineralization, exceptional aquamarine crystals, and associated chrysoberyl-family gems in the surrounding district.
The ore and specimen bodies were pegmatitic rather than conventional metallic ore bodies. The collectible aquamarine came from pockets and weathered pegmatite zones where beryl crystals were liberated or partly etched by late fluids and weathering. Published and dealer-described specimens show crystals ranging from slender 3–7 cm miniatures through small-cabinet crystals of 7–12 cm, with exceptional larger crystals reaching stout cabinet size. The classic habit is a complete floater or near-floater, either barrel-shaped with swollen prism faces and tapering ends, or a long, narrow, hexagonal prism with a natural termination and etched side faces. Albite is documented as an associated mineral in photo-based occurrence data, and old regional work on the chrysoberyl deposits of Bahia records aquamarine with tourmaline, garnet, rose quartz, amethyst, zircon and andalusite in nearby southeastern Bahia gem workings.
Mining history at Jaquetô is scattered through specimen literature rather than formal mine reports. Early Jaquetô aquamarine specimens are recorded from the 1970s, and the locality became conspicuous to collectors around the turn of the 1990s. A 1991 gemological abstract specifically noted aquamarine crystals from the Jaqueto mine, Bahia, among gem-quality minerals seen at the 1991 Tucson Gem and Mineral Show. A museum record for MM Gerdau’s collection describes a 1990 pocket at Lavra do Jaquetô that contained more than 100 kilograms of fine barrel-shaped aquamarine crystals, a statement that explains why so many classic Jaquetô pieces on the market share a consistent etched, clean, blue-green “family look.”
The mine’s operators are not usually named in the collector literature. Jaquetô is better described as a garimpo-style prospect or small mine than as a modern, continuously operated industrial mine. In the chrysoberyl literature, the Jaquetó prospect at Salomão was already described in the early 1990s as being in the process of closing, while a number of southeastern Bahia chrysoberyl and aquamarine prospects were noted as abandoned or in reduced activity. For collectors today, that history matters: new production is not a dependable market source, and most significant Jaquetô aquamarines seen in collections, auctions and dealer archives are old finds, old stocks, or recycled collection specimens.
Access should be treated accordingly. Jaquetô is not a public collecting site; any field visit would require permission from landowners and mineral-rights holders, local knowledge, and ordinary Brazilian mine-safety precautions. From the specimen buyer’s perspective, the practical “access” to Jaquetô is through collections, dealer inventories and auction appearances rather than through fresh field collecting.
Jaquetô aquamarine is prized for etched, highly lustrous, gemmy crystals in blue to blue-green tones, most famously as complete floaters, tapering prisms and “barrel” crystals with swollen centers and corroded, glittering prism faces. Documented specimens include slender crystals near 3 cm, elongated examples over 19 cm, small-cabinet crystals around 6–9.5 cm, and exceptional stout crystals approaching 18 cm; a museum-described 1990 pocket reportedly yielded more than 100 kilograms of attractive crystals of this general type. The best pieces here combine body color, transparency, undamaged completeness, and sculptural etching, while ordinary pieces lose much of the Jaquetô appeal if they are chipped, too pale, waterworn, heavily bruised at the terminations, or merely gem rough without an aesthetic crystal form.
Beryl from Jaquetô is essentially the same Be3Al2Si6O18 species expressed as colorless to blue-green gem beryl, with the collector market tending to call the blue material aquamarine and the broader species simply beryl when color is pale, mixed, or described taxonomically. The locality’s beryl crystals are known as prismatic to barrel-shaped, commonly naturally etched, and often remarkably transparent; fine examples preserve a complete hexagonal crystal or floater outline rather than being broken gem rough. Good Jaquetô beryl is separated from average Brazilian beryl by its crisp luster, clean interior, delicate sea-green to blue color zoning, natural termination, and the distinctive tapering or etched morphology that became associated with the Jaquetô style.
The verified mineral list for the mine itself is short, with beryl and aquamarine as the core species. The surrounding Jaquetô–Guaratinga–Medeiros Neto gem district is also important for chrysoberyl, including alexandrite and cat’s-eye material: published gemological work records a very pale V-twinned alexandrite crystal of 6,250 grams from the Jaquetó prospect at Salomão, and GIA’s chrysoberyl review records a major 25.2 kg chrysoberyl crystal and the 6,250 gram “Mitra” or “Bishop’s hat” cat’s-eye from Jaqueto. Schorl is also recorded from the Jaqueto area as brilliant, striated black prisms in groups to large size, but that material should be labelled carefully as “Jaqueto area” unless a specimen has firmer mine-level provenance.
The first authenticity issue with Jaquetô is locality, not species. A gemmy etched aquamarine crystal from Brazil can be visually compatible with Jaquetô, but the same general Be-bearing pegmatite world also includes Minas Gerais, Espírito Santo, Bahia localities outside Guaratinga, and even non-Brazilian sources that may imitate the look. Strong Jaquetô provenance is therefore valuable: old labels, collection history, dealer archive matches, published references, or a chain through known Brazilian gem-mineral dealers all matter.
Older labels may read “Jaqueto Mine,” “Jaquetó,” “Jaquetô,” “Guaratinga,” “Bahia,” “Medeiros Neto,” or simply “Brazil.” The spelling variation is normal, but vague “Brazil aquamarine” labels should not be upgraded to Jaquetô on style alone. Likewise, the locality is sometimes confused with Minas Gerais in old captions or casual descriptions; modern locality treatment places Jaquetô at Guaratinga, Bahia.
The main condition issues are edge chipping, bruised terminations, broken pocket-attachment areas, and internal cracks that may be disguised by the brilliant etched surfaces. Because the crystals are commonly gemmy, even small bruises flash conspicuously under display lighting. Examine both ends of tapering crystals: some pieces are complete floaters, while others are broken at a cavity-wall attachment and later described too generously as “nearly complete.” Etched surfaces should look natural and continuous, not artificially acid-dulled or re-polished.
Heat treatment is less central for mineral specimens than for faceted aquamarine, but color language still deserves care. Many Jaquetô crystals are naturally pale to sea-blue-green; strong color claims should be weighed against photographs, lighting and saturation. The finest specimens are valued for natural color, transparency and crystal form together, not for exaggerated blue alone. Repairs and glued-on matrix are less commonly discussed for this locality because most classic specimens are loose floaters, but any matrix piece or unusually dramatic association should be inspected under magnification and UV.
Market availability is limited but not nonexistent. Small, slender Jaquetô aquamarines appear periodically, while undamaged, stout, highly gemmy, old-pocket crystals have become serious collection pieces. The best examples compete with faceting value, old Brazilian provenance, and the broader appetite for classic pegmatite gem crystals; large, clean, complete pieces can rise sharply in price when they appear at auction.
The Jaquetô story turns on a simple collector’s tragedy: the very thing that makes the crystals beautiful also makes them vulnerable to the lapidary wheel. One widely reproduced specimen description calls a 7.5 x 3.8 x 3.2 cm, 147 gram floater “a natural jewel,” then points to the fat transparent center of the barrel and explains the problem. A gem dealer estimated that, if the cut worked ideally, the central portion could yield a $10,000 gemstone. That is the hard arithmetic behind the scarcity of fine Jaquetô specimens: once a crystal can become a valuable cut stone, the mineral specimen must be bought against its own destruction.
The most important modern pocket recorded for collectors is the 1990 discovery described in the MM Gerdau collection: a “baggings” or pocket at Lavra do Jaquetô containing more than 100 kilograms of beautiful aquamarine crystals. The museum’s example is a clear, barrel-shaped 5.5 x 2.8 x 2.3 cm aquamarine, the sort of compact gem crystal that defines the locality. The description’s phrase “barrel” is not decorative; it is the visual key. Jaquetô crystals often swell and taper, their etched faces catching light in a way that makes them look less like straight prisms and more like naturally carved glass.
By 1991, the locality had reached the international collector stage. The Journal of Gemmology abstracted a Mineralogical Record “What’s New in Minerals?” report from the 1991 Tucson Gem and Mineral Show and placed aquamarine crystals from the Jaqueto mine, Bahia, among the gem-quality minerals being seen that year. That short listing is easy to pass over, but it marks the point at which a local Brazilian pocket became part of the global mineral-show memory, displayed alongside Paraíba tourmaline, Pakistani diopside, Jeffrey mine vesuvianite, Pakistani apatite and Cruzeiro tourmaline.
One auction specimen shows how far the name could travel. In October 2013, Heritage Auctions sold a stout Guaratinga–Jaquetô aquamarine for $35,000. It weighed almost exactly one kilogram, or 5,021.5 carats, and measured 17.8 x 5.7 x 5.7 cm. The catalogue writer, evidently enjoying the crystal’s mass, compared it to a “blunt instrument” in an Agatha Christie story and called it a “hefty blue green monster.” Beneath the theatrical prose was a serious mineralogical observation: much of the terminated crystal was gem quality, but its transparency was broken and amplified by re-solution textures, producing myriad small reflective faces parallel to the long axis.
Another strand runs through Richard Kosnar, whose collection provenance accompanies a small Jaquetô aquamarine sold in 2021. That crystal, only 3.2 x 0.5 x 0.4 cm and 12.55 carats, was described as mined in the early 1970s, from a period when Kosnar was bringing back quantities of Brazilian pegmatite minerals. It is a reminder that Jaquetô was not only a single 1990 event; it had already entered the hands of serious American pegmatite collectors years earlier, in the era when Brazilian dealers, field buyers and visiting collectors were still building many of the classic suites now dispersed through auctions and private collections.
