The Geode Gallery
130 million years
in the making.
Rare amethyst geodes from 1ft to 8ft, formed when the South Atlantic was born, and now held in the UK. View any piece with us, one to one, on a private video call.
- Pieces available now
- 10
- Sizes
- 1–8ft
- Age
- c. 130m years
- Prices
- On request
The collection · 10 available to view
Every piece is one of a kind
Measured by hand and photographed as it stands today. Choose a size, then book a private viewing to see it live.
Available to view8ftTCS-G11 · BrazilThe ImperialCathedral geode · approx. 700kg · Grade AAAPrice on request · View 1-2-1 →
Available to view7ftTCS-G10 · BrazilThe Cathedral RoyaleCathedral geode · approx. 520kg · Grade AA+Price on request · View 1-2-1 →
Available to view6ft 6inTCS-G09 · UruguayThe Twin SentinelsMatched pair (cut from one geode) · approx. 840kg · Grade AAAPrice on request · View 1-2-1 →
Available to view6ftTCS-G08 · UruguayThe Violet HallCathedral geode · approx. 380kg · Grade AAAPrice on request · View 1-2-1 →
Reserved5ft 6inTCS-G07 · BrazilThe GrottoOpen cave geode · approx. 340kg · Grade AAPrice on request · View 1-2-1 →
Available to view5ftTCS-G06 · BrazilThe SanctuaryCathedral geode · approx. 240kg · Grade AA+Price on request · View 1-2-1 →
Available to view4ft 6inTCS-G05 · UruguayThe Amethyst ThroneCathedral geode · approx. 190kg · Grade AAPrice on request · View 1-2-1 →
Available to view4ftTCS-G04 · BrazilThe ChapelCathedral geode · approx. 150kg · Grade AAPrice on request · View 1-2-1 →Available to view3ftTCS-G03 · UruguayThe AltarCathedral geode · approx. 70kg · Grade AA+Price on request · View 1-2-1 →
Available to view2ftTCS-G02 · BrazilThe HearthCathedral geode · approx. 32kg · Grade AAPrice on request · View 1-2-1 →
Available to view1ftTCS-G01 · UruguayThe KeepsakeGeode pair · approx. 9kg · Grade AAAPrice on request · View 1-2-1 →Deep time
How your geode was made
Every amethyst geode in our gallery began as a bubble in molten rock, in the age of the dinosaurs.
- c. 135–130 million years agoFire
As South America and Africa began to tear apart and the South Atlantic Ocean was born, colossal lava flows flooded what is now southern Brazil and northern Uruguay. Dinosaurs still walked the Earth.
- As the lava cooledHollow
Gas bubbles trapped in the thick basalt left hollow cavities. Some were small, but some were big enough for a person to stand inside.
- Over geological timeGrowth
Mineral-rich water seeped through the rock, lining each cavity first with a skin of agate, then with quartz crystals, one microscopic layer at a time. Geologists still debate exactly how long this took, and it is measured in spans far longer than human history.
- Deep in the earthColour
Traces of iron within the quartz, touched by natural radiation from the surrounding rock, slowly turned the crystals purple. The deeper and more even the colour, the rarer the geode.
- TodayDiscovery
Freeing a large geode intact from solid basalt is painstaking work. Only a small fraction emerge whole, with deep colour and fine crystals worthy of a gallery.
- Your spaceLegacy
Held in the UK, viewed with you one to one, and placed in its new home: a piece of the Earth older than the South Atlantic Ocean itself.
Heritage & meaning
Amethyst: a stone of royalty
For thousands of years amethyst has been worn by monarchs, bishops and collectors. A large geode brings that heritage into a room in its most dramatic, natural form.
Purple has been the colour of royalty for millennia. A large amethyst sits beneath the cross of the Sovereign's Orb in the British Crown Jewels, and Catherine the Great of Russia was famed for her amethyst jewels.
For centuries amethyst was counted among the "cardinal gems", treasured alongside diamond, ruby, sapphire and emerald, until great deposits were found in South America in the 19th century.
Bishops traditionally wear amethyst rings, and the stone has long symbolised wisdom, piety and calm authority.
Its name comes from the Ancient Greek amethystos. The Greeks believed it kept the mind clear, and are said to have carved drinking cups from it.
In crystal and feng shui traditions, an amethyst geode is placed to bring a calm, protective atmosphere to a home, and is linked with abundance and peace.
1-2-1 online viewings
See it live, from wherever you are
- Book a time that suits you. Viewings are by appointment only.
- Meet us on video (Zoom, Google Meet, WhatsApp or FaceTime) for around 30 minutes.
- See your piece up close: we walk round it, show the crystals in different light and measure it live.
- Receive your price and a condition report by email, with no obligation.
- Reserve, then relax while we plan white-glove delivery and placement.
Understanding grade
- AAA
- Deep, even colour throughout, large well-formed crystals, exceptional presence.
- AA+
- Rich colour with excellent crystal formation and features such as calcite.
- AA
- Attractive purple colour and glittering druzy, great value for its size.
Amethyst can fade in strong direct sunlight, so we'll advise on placement. Every condition report discloses any repair, backing or stabilisation.
The service
Bought with confidence, delivered with care
For designers & hospitality
Trade and project enquiries
Interior designers, architects, hotels, spas and retailers can access trade terms, sourcing for specific sizes or colours, and installation scheduled around your build.