Text: Joanna Sobel, founder of Brazi6 min read · Brazi Druse Jewelry editorial team
On Saturday and Sunday, October 3–4, from 10:00 to 18:00, Warsaw Mineral Expo is taking place at the Palace of Culture and Science. Before buying a “geode” there, check what you are holding: a geode is a rounded formation, usually with an internal cavity lined with crystals; a druse consists of crystals that have grown on the walls of a cavity or a fissure in rock; and a crystal cluster is a druse in which the crystals stand densely next to one another on a shared base. The organizers and the PKiN announce nearly 300 exhibitors from Poland and abroad across 8,000 m².
- Date: Saturday and Sunday, October 3–4, 10:00–18:00, Palace of Culture and Science, plac Defilad 1.
- Tickets: regular 30, reduced 20, and family 80 złoty; children up to and including 6 years old enter free of charge.
- Geode, druse, crystal cluster: a geode has a cavity in cross-section, a druse is made of crystals that have grown on a surface, and a crystal cluster is a druse with a dense tuft of crystals. A cross-section of a Brazilian agate geode is featured in our necklace with a 45 cm chain for PLN 189.
- Geodes in Poland: yes, for example inside Lower Silesian agates.
Expo at the PKiN: tickets, wristband, and appraisers
A reduced-fare ticket is available to, among others, people under 18, pensioners, and disability pensioners, while the family ticket covers two adults and any number of minor children. You can buy a ticket on-site, including by card, or online.
The wristband is valid for both days, so after visiting on Saturday, you can return on Sunday. The organizers also announce advice from experts and appraisers from all over Poland. If you have doubts about a specimen, ask an expert before you pay.
Geode: how to recognize one
At the stall, you can recognize a geode by its cross-section: a shell on the outside, crystals around a cavity inside, and bands between them in agate geodes. Geodes form in cavities in sedimentary rocks or in lava, from a gas bubble trapped in cooling rock. In an agate geode, concentric layers first deposit on the walls of such a bubble, and then crystals grow toward the center. Many geodes on the market come from Brazil and Uruguay, and the basalt there also contains large geodes lined with amethyst.
When the bands are made of agate, a geode cut into thin slices produces slices. Our necklace features one such slice - a cross-section of a Brazilian agate geode with brown chalcedony rings around a crystalline center. The surface is polished, the edge remains rough, and the flat pendant in a gold-plated silver setting does not twist.
From 1825 onward, raw agate from southern Brazil flowed to Idar (now Idar-Oberstein in Germany), where local deposits were becoming depleted. According to Scientific American in 1882, as much as 300 tons of agate were shipped there each year (via GIA, Gems & Gemology).
Druse: crystals grown on a surface
“Druse” in the name Brazi Druse Jewelry refers precisely to a druse. The Polish dictionary PWN derives the Polish word from the English druse, which in turn comes from the German Druse. When you buy a druse, you are buying a piece of the wall of a rock cavity - a slab or a chunk from which crystals grow on one side.
Our second necklace features an amethyst druse from Brazil, cut into a heart shape and set in gold-plated silver. Tiny crystals reflect light at different angles, making the heart sparkle in spots. With the shortest chain, the necklace costs PLN 229. The citrine druse star earrings, priced at PLN 220, have a silver setting, along with a 925 sterling silver post and butterfly back.
A druse can also weigh several kilograms. Table no. 243 is a citrine druse from Brazil that weighs 8.45 kg and is 29 cm wide, or 45 cm high with the gold-colored frame. Natural citrine is rare, so most citrine sold commercially is made from amethyst. Brazilian amethyst heated to around 470 °C turns pale yellow, while at 550–560 °C it develops a stronger color ranging from yellow to reddish brown. The price includes the stone in the frame. We make the glass top to order: each druse has a different outline, so we cut it to fit that specific piece at a partner glassworks. You choose the shape, such as round or square, and we quote the price of the top separately.
Cluster: crystals densely covering a single base
The crystals in a cluster are usually different sizes, and clusters themselves grow on the walls of geodes, so in the trade, including here, the distinction between a druse and a cluster can be fluid. When buying, check that the crystal tips are not chipped, and ask where the specimen comes from.
Our amethyst cluster no. 126 comes from the Rio Grande do Sul region of Brazil. It weighs 6.95 kg, is 30 cm high and 24 cm wide, and measures 45 cm with the stand.
Colorful agate slices: what to ask at the stand
When looking at a colorful agate slice, ask directly whether it has been dyed. This is an old, accepted practice, as long as the seller discloses it: agate is a porous variety of chalcedony and readily absorbs dye. In the 19th century, a famous dyeing method was developed in what is now Idar-Oberstein, and agates dyed in almost every color are common in the jewelry trade. According to the International Gem Society, intensely colored agates are probably dyed. We show how to recognize dyeing using a green agate as an example.
Are there geodes in Poland?
Yes. The Earth Museum of Adam Mickiewicz University in Poznań explains that the interior of Lower Silesian agates sometimes contains geodes, meaning round or oval cavities lined with quartz crystals. A well-known agate site is Płóczki Górne near Lwówek Śląski: the agates there filled gas bubbles in solidified lava and are usually several centimetres across.
The fair also features a special exhibition, “Colours of Lower Silesian Quartz,” with entry from the Malachite Hall. These are specimens from the collection of Łukasz Tekiela, who will give guided tours of the exhibition at 14:00 on Saturday and Sunday.
While you're at the fair: a druse and a crystal cluster at the boutique on Grzybowska
Cluster no. 126 and table no. 243 are at our boutique at 61 Grzybowska Street, in the Platinum Towers arcade on the ground floor. On Friday, we are open until 19:00; on Saturday, during the same hours as the fair, 10:00-18:00; and on Sunday, the boutique is closed. So stop by on Friday or Saturday, during a break from the fair. Until October 15, both specimens are part of the “Open Display Case” promotion: for the products listed above, we give the discounted price and the lowest price in the 30 days before the discount.
We also sell unique pieces in our online store, so if you are coming for a specific specimen, call +48 575 666 195: we will check whether it has sold and set it aside for you.
Try it on in person
61 Grzybowska Street, unit 5, 00-844 Warsaw - Platinum Towers Shopping Arcade, ground floor, next to the Norblin Factory and Browary Warszawskie; Wola district.
Mon-Fri 11:00-19:00 · Sat. 10:00-18:00 · Sun. closed. Parking is paid, but the first hour is free with purchases at the boutique.
Call: +48 575 666 195 - we will set aside the selected piece.
Enter the code for your first purchase BRAZIBLOG10 - you will receive a 10% discount.
How we checked it. Date, opening hours, tickets and exhibition: the organizer's website (gieldymineralow.pl) and pkin.pl, September 28, 2026. Definitions of geodes and druses: PWN Dictionary of the Polish Language; crystal clusters, how geodes form and agates from Płóczki Górne: Polish Wikipedia; geodes from Brazil and Uruguay: English Wikipedia; geodes in Lower Silesian agates: the UAM Earth Museum; the history and dyeing of agate: GIA, Gem-A, International Gem Society; citrine from amethyst: GIA and German Wikipedia (entry “Citrin”). Prices, dimensions and materials: product pages in the store as of September 28, 2026.