Materials, houses and reading coverage

Diamond

Diamond is crystalline carbon.

1,934 words across 2 studies · Published reading · prior source review retained

Ruby

Ruby is red corundum, the same mineral species as sapphire.

1,937 words across 2 studies · Published reading · prior source review retained

Sapphire

Sapphire is gem corundum other than the red material called ruby.

1,951 words across 2 studies · Published reading · prior source review retained

Emerald

Emerald is green to bluish-green beryl.

1,856 words across 2 studies · Published reading · prior source review retained

Aquamarine

Blue beryl links high mountain crystals, delicate colour and a remarkable carved obelisk.

943 words across 1 study · Published reading · prior source review retained

Morganite

Morganite is the pink to orange-pink variety of beryl.

758 words across 1 study · Published reading · prior source review retained

Alexandrite

Alexandrite is a colour-change variety of chrysoberyl.

1,109 words across 2 studies · Published reading · prior source review retained

Garnet

A family of reds, oranges and greens whose tiny crystals can reveal very long journeys.

965 words across 1 study · Published reading · prior source review retained

Spinel

Gem spinel belongs to a wider mineral group but is a distinct gem identity from ruby.

1,153 words across 2 studies · Published reading · prior source review retained

Tourmaline

One mineral group can hold a whole palette, sometimes inside a single crystal.

953 words across 1 study · Published reading · prior source review retained

Topaz

A wide colour range, a misleading ancient name and a hardness number that does not tell the whole story.

958 words across 1 study · Published reading · prior source review retained

Zircon

A natural gem can sparkle in jewellery and preserve evidence older than most rocks.

984 words across 1 study · Published reading · prior source review retained

Peridot

An iron-coloured green gem whose story reaches from Red Sea records to meteorites.

963 words across 1 study · Published reading · prior source review retained

Tanzanite

Tanzanite is blue-to-violet zoisite.

1,131 words across 2 studies · Published reading · prior source review retained

Opal

Opal is hydrated silica without the regular long-range crystal structure of minerals such as quartz.

1,815 words across 2 studies · Published reading · prior source review retained

Jade

Jade rewards a closer look at how mineral grains, cultural names and the carver’s choices fit together.

Also find: jadeite (constituent material); nephrite (constituent material)

923 words across 1 study · Published reading · prior source review retained

Lapis Lazuli

A blue rock can carry a story from mountain geology to jewellery and the painter’s palette.

Also find: lapis

925 words across 1 study · Published reading · prior source review retained

Turquoise

Blue-green colour, microscopic crystals and carefully fitted mosaic pieces reveal several scales of turquoise’s story.

840 words across 1 study · Published reading · prior source review retained

Pearl

Pearls grow in molluscs.

852 words across 1 study · Published reading · prior source review retained

Amber

Ancient tree resin can carry a forest’s traces, a carver’s decisions and an unexpected blue glow.

893 words across 1 study · Published reading · prior source review retained

Amethyst

Purple quartz connects crystal-lined cavities, ancient carving and the modern cutter’s handling of colour.

863 words across 1 study · Published reading · prior source review retained

Citrine

Yellow quartz invites a clear distinction between the mineral’s growth, its colour history and its later life in jewellery.

947 words across 1 study · Published reading · prior source review retained

Ametrine

Ametrine is quartz with contrasting amethyst-like purple and citrine-like yellow-to-orange zones in one gem.

737 words across 1 study · Published reading · prior source review retained

Rose Quartz

Rose quartz is the familiar pink, usually cloudy variety of quartz.

747 words across 1 study · Published reading · prior source review retained

Moonstone

Moonstone is a feldspar gem defined by a floating sheen called adularescence.

725 words across 1 study · Published reading · prior source review retained

Sunstone

Sunstone is an appearance-based gem name used for more than one feldspar material.

802 words across 1 study · Published reading · prior source review retained

Iolite

Iolite is gem cordierite, a silicate with conspicuous pleochroism.

792 words across 1 study · Published reading · prior source review retained

Kunzite

Kunzite is pink to violet spodumene.

786 words across 1 study · Published reading · prior source review retained

A name is not always a species

Learn to separate mineral identity, gem variety, colour and cutting style before comparing two stones.

708 words across 1 study · Published reading · prior source review retained

Beyond single crystals

Explore rocks, mineral aggregates, opal, amber and pearls without forcing every gem into the single-crystal model.

706 words across 1 study · Published reading · prior source review retained

Origin, identity and resemblance

Separate how a gem formed, what it is and what it resembles, with examples that make confusing labels readable.

693 words across 1 study · Published reading · prior source review retained

Ask what happened after growth

Follow a gem beyond formation: learn what heating, filling, coatings and assembled construction can change.

709 words across 1 study · Published reading · prior source review retained

A source map is a guide, not a passport

Read source regions, historical routes and origin opinions without mistaking a country marker for a specimen passport.

713 words across 1 study · Published reading · prior source review retained

Three questions before daily wear

Use three separate durability questions to make sense of scratching, chipping, fading and everyday care.

699 words across 1 study · Published reading · prior source review retained

Who discovered a gemstone?

Learn to distinguish first surviving evidence, mineral recognition, naming, a new deposit and a commercial launch.

704 words across 1 study · Published reading · prior source review retained

Families, glossary & next chapters

Navigate the mineral families and the language of colour, light and provenance.

400 words across 1 study · Published reading · prior source review retained

Cartier

From a Paris family business to sculptural panthers and disciplined modern forms, Cartier’s history turns on the productive tension between exceptional stones and instantly legible design.

720 words across 1 study · Published reading · prior source review retained

Van Cleef & Arpels

A clover, a dancer and a working zipper reveal a house whose imaginative world is built on precise mechanical and lapidary problems.

Also find: Van Cleef and Arpels

761 words across 1 study · Published reading · prior source review retained

Tiffany & Co.

The six-prong solitaire is only one chapter in a history that also includes ambitious silverwork, a remarkable yellow diamond and designers with strikingly different ideas about the body.

Also find: Tiffany and Co

780 words across 1 study · Published reading · prior source review retained

Harry Winston

The New York house’s identity connects a dealer’s eye for remarkable gems with sculptural settings, a travelling exhibition and an unexpectedly ordinary postal package.

787 words across 1 study · Published reading · prior source review retained

Agate

A patterned quartz material whose bands record changing conditions inside rock cavities.

751 words across 1 study · Published reading · prior source review retained

Carnelian

Translucent orange-to-red chalcedony with a long history of beadmaking and deliberate colour enhancement.

725 words across 1 study · Published reading · prior source review retained

Chrysoprase

Nickel-coloured green chalcedony, often prized for an even translucent glow.

737 words across 1 study · Published reading · prior source review retained

Onyx

A chalcedony name that connects layered cameos with the polished black surfaces of modern jewellery.

745 words across 1 study · Published reading · prior source review retained

Jasper

Opaque patterned silica whose trade names need more care than its familiar appearance suggests.

760 words across 1 study · Published reading · prior source review retained

Rock Crystal

Colourless quartz valued for transparency, carved volume and the skill required to shape it.

Also find: colourless quartz

715 words across 1 study · Published reading · prior source review retained

Smoky Quartz

Brown-to-grey quartz whose colour connects crystal defects, natural radiation and deliberate treatment.

736 words across 1 study · Published reading · prior source review retained

Cat’s-Eye Chrysoberyl

An oriented cabochon in which aligned inclusions turn a point of light into a moving bright band.

Also find: cat's-eye chrysoberyl

712 words across 1 study · Published reading · prior source review retained

Boucheron

A spring-hidden necklace, sculpted gold and a ring assembled from four patterns show how Boucheron turns construction into a way of wearing jewellery.

736 words across 1 study · Published reading · prior source review retained

Chaumet

From the Nitot workshop to light-looking head ornaments and coded gemstone messages, Chaumet’s history asks how a jewel can carry both structure and meaning.

758 words across 1 study · Published reading · prior source review retained

Bulgari

A Greek silversmith’s Roman shops grew into a design language of rounded gems, flexible metal and strong colour, with archives that reward looking past the celebrity story.

781 words across 1 study · Published reading · prior source review retained

Buccellati

Engraving, openwork and sculpted silver make Buccellati a study in how precious metal can suggest woven fabric, a living creature or a surface softened by light.

801 words across 1 study · Published reading · prior source review retained

Fluorite

Fluorite can look like a box of watercolours made solid.

Also find: fluor-spar; fluorspar

558 words across 1 study · Sources reviewed this edition

Apatite

Apatite is a gem name that needs a little unpacking.

Also find: fluorapatite (group member)

540 words across 1 study · Sources reviewed this edition

Andalusite

Andalusite rewards a second look.

Also find: chiastolite (variety)

568 words across 1 study · Sources reviewed this edition

Diopside

Diopside is a mineral species in the pyroxene group, with ideal composition CaMgSi₂O₆.

Also find: chrome diopside (chromium-bearing); star diopside (optical effect)

455 words across 1 study · Sources reviewed this edition

Titanite / sphene

Titanite is the mineral name; sphene remains familiar in gem writing.

Also find: sphene

447 words across 1 study · Sources reviewed this edition

Benitoite

Benitoite is a barium titanium silicate species, BaTiSi₃O₉, not a variety of sapphire.

462 words across 1 study · Sources reviewed this edition

Kyanite

Kyanite often grows as long, flattened blades, sometimes bent or twisted.

Also find: cyanite; disthene; blue kyanite; orange kyanite

522 words across 1 study · Sources reviewed this edition

Prehnite

Prehnite is familiar as a translucent green cabochon, often with a cloudy, rounded appearance.

Also find: green prehnite; yellow prehnite; prehnite with epidote; SunJade; Golden SunJade; Flower SunJade

500 words across 1 study · Sources reviewed this edition

Rhodochrosite

Rhodochrosite can appear as translucent pink-and-white bands or as transparent crystals with a vivid red to orange-pink appearance.

Also find: Inca rose; rosa del Inca; banded rhodochrosite

507 words across 1 study · Sources reviewed this edition

Rhodonite

Rhodonite is best known in opaque pink carvings, beads and cabochons with contrasting dark markings.

Also find: pink rhodonite; manganese silicate; massive rhodonite

520 words across 1 study · Sources reviewed this edition

Malachite

Malachite's bands, swirls and rounded forms make it recognizable, but no single pattern proves identity.

Also find: green malachite; banded malachite; azurite-malachite (mixture)

524 words across 1 study · Sources reviewed this edition

Azurite

Azurite ranges from bright blue crusts to richly coloured crystals that can appear nearly black in thick sections.

Also find: blue azurite; azurite-malachite (mixture)

528 words across 1 study · Sources reviewed this edition

Chopard

A watchmaker's heritage, moving diamonds and the difference between a material story and a finished jewel's construction.

956 words across 1 study · Sources reviewed this edition

Graff

A London origin, the Lesedi La Rona transformation and a way to distinguish gem information from house storytelling.

969 words across 1 study · Sources reviewed this edition

Mikimoto

From a half pearl attached to a shell to a strand, a workshop and a monumental bell, Mikimoto’s history connects living growth with the deliberate work of making jewellery.

976 words across 1 study · Sources reviewed this edition

TASAKI

A cultivation business became a contemporary design house. The balance ring makes that change visible through the meeting of individual pearls and a deliberately rigid line.

986 words across 1 study · Sources reviewed this edition

Georg Jensen

A Copenhagen house read through Art Nouveau ornament, Torun's clasp and the distinction between a design date and a later reference launch.

969 words across 1 study · Sources reviewed this edition

Damiani

Valenza craft, Gabriella Damiani’s Shark bracelet and a changing corporate portfolio show why a jewellery house and its holding structure need separate histories.

992 words across 1 study · Sources reviewed this edition

Calcite

Calcite connects visible double refraction with rocks, precision optics and traceable carved objects; its softness, cleavage and acid sensitivity shape how it should be handled.

Also find: Iceland spar (clear calcite); dogtooth calcite (crystal habit); calcite alabaster (carbonate ornamental material)

1,209 words across 1 study · Sources reviewed this edition

Gypsum

Clear crystals, carved alabaster and giant Naica beams share hydrated calcium-sulfate chemistry; documented objects and growth measurements explain why texture, time and careful handling matter.

Also find: gypsum alabaster (fine-grained aggregate); gypsum rose (rosette crystal aggregate); fibrous gypsum (texture)

1,077 words across 1 study · Sources reviewed this edition

Scapolite

Scapolite is a group and compositional series, not one fixed species recipe. Named specimens, temporary colour changes and inclusion-based iridescence show why its light effects need different explanations.

Also find: marialite (scapolite group member); meionite (scapolite group member); silvialite (scapolite group member); cat's-eye scapolite (optical effect); rainbow scapolite (included material); tenebrescent scapolite (observed effect)

1,161 words across 1 study · Sources reviewed this edition

Sodalite

Sodalite is a mineral species; blue appearance, lapis resemblance and hackmanite research each require their own scope.

Also find: hackmanite (sulfur-bearing, colour-change variety terminology); sodalite-bearing aggregate; sodalite versus lapis lazuli

1,025 words across 1 study · Sources reviewed this edition

Serpentine

Serpentine is a group/material term; constituent mineral identity, cultural names and an object’s recorded history each need their own scope.

Also find: bowenite (serpentine material term); tangiwai (Māori cultural material name); antigorite (constituent species); lizardite (constituent species); chrysotile (constituent mineral forms)

989 words across 1 study · Sources reviewed this edition

Obsidian

Obsidian is natural volcanic glass. Chemical sourcing, archaeological context and collecting history give different kinds of evidence about an object.

Also find: rainbow obsidian (optical trade descriptor); fire obsidian (optical trade descriptor); volcanic glass

1,096 words across 1 study · Sources reviewed this edition

Hematite

Hematite connects contrasting mineral forms with carved seals, pigments and measured research; an object’s identity and history still need their own evidence.

Also find: specular hematite (metallic form); red ochre (earthy material context); magnetic imitation case (identity comparison)

1,237 words across 1 study · Sources reviewed this edition

Pyrite

Pyrite’s brassy appearance leads into distinct questions about crystal structure, documented objects, trace-gold research and humidity-sensitive conservation.

Also find: fool’s gold (appearance nickname); marcasite (related dimorph, distinct species); pyrite suns (specimen form)

1,296 words across 1 study · Sources reviewed this edition

Charoite

Charoite is a mineral species within mixed ornamental rock; dated descriptions, structural studies and measured sample scopes keep the purple story precise.

Also find: charoitite (charoite-bearing rock); charoite-90 (studied structural polytype); Murun massif (documented occurrence)

1,297 words across 1 study · Sources reviewed this edition

Sugilite

Sugilite is a mineral species; purple gem material can be a mixed aggregate. Its history becomes clearer when a name, a laboratory result and a carved object are given their own timelines.

Also find: purple sugilite aggregate; Wessels sugilite study

1,188 words across 1 study · Sources reviewed this edition

Larimar

Larimar is the trade name for blue pectolite from the Dominican Republic. A careful account follows the material, its commercial name and the limits of the colour research separately.

Also find: blue pectolite; larimar

1,215 words across 1 study · Sources reviewed this edition

Tektites

Tektites are natural impact glasses made from terrestrial material; moldavite is a regional tektite topic within this profile. Formation, findspot and the later history of a collected object deserve separate records.

Also find: moldavite tektite; australites; impact glass

1,318 words across 1 study · Sources reviewed this edition

Labradorite

Labradorite is a compositional member of the plagioclase feldspar series. Its moving colour becomes clearer through layered optics, a documented cameo and careful distinctions between identity, appearance and treatment.

Also find: labradorescence; rainbow moonstone (trade usage; feldspar identity requires context)

1,406 words across 1 study · Sources reviewed this edition

Amazonite

Amazonite is blue-green microcline. Virginia pegmatite, Mongolian granite, colour experiments and a museum acquisition show how a variety name can connect several kinds of evidence without becoming a new mineral species.

Also find: blue-green microcline; Morefield Amazonite; Avdar Amazonite

1,317 words across 1 study · Sources reviewed this edition

Tiger’s-eye quartz

Tiger’s-eye is chatoyant quartz. Its moving band, a disputed formation interpretation and a carefully mounted museum slab show why optical appearance, geological history and object durability need different evidence.

Also find: tiger eye quartz; tiger's-eye quartz; chatoyant quartz; tiger’s-eye formation debate; Marra Mamba tiger’s-eye

1,392 words across 1 study · Sources reviewed this edition

Danburite

A named museum gem and a pressure experiment reveal different questions about danburite, from a documented acquisition to changing atomic arrangements.

Also find: golden yellow danburite; danburite pressure research

1,266 words across 1 study · Sources reviewed this edition

Jet

Jet connects unresolved formation questions with carefully documented jewellery: a Whitby chessboard, a reconstructed Scottish set and grave-position evidence.

Also find: Whitby jet jewellery; Balgay jet reconstruction; Dunragit jet research

1,298 words across 1 study · Sources reviewed this edition

Ammolite

Ammolite can be read through its animal, preserved shell layer, optical research and jewellery construction, with each story kept at its proper scale.

Also find: Ammolite shell layer; Ammolite doublet and triplet; Alberta Ammolite research

1,260 words across 1 study · Sources reviewed this edition

Red beryl

Read the Utah geological account alongside laboratory comparisons, keeping growth origin and clarity treatment separate.

Also find: hydrothermal synthetic red beryl (growth origin qualified)

1,264 words across 1 study · Sources reviewed this edition

Grandidierite

A blue-green mineral becomes clearer through directional colour, a measured Madagascar study and carefully attributed small-gem records.

Also find: grandidierite pleochroism; grandidierite inclusions in sapphire

1,275 words across 1 study · Sources reviewed this edition

Sphalerite

A zinc sulfide mineral links an internal three-arm observation, a carefully arranged colour pattern and a documented museum gem.

Also find: sphalerite internal windmill structures; sphalerite centred colour zoning

1,340 words across 1 study · Sources reviewed this edition

Boodles

A guide to separate business milestones, present stewardship, material provenance and compositional observation.

1,579 words across 1 study · Sources reviewed this edition

Mellerio

Distinguishing a family narrative, a gemstone-cut specification, a recurring motif and a named collection.

1,518 words across 1 study · Sources reviewed this edition

David Webb

Reading design, manufacture, workshop practice and object identifiers without confusing them.

1,556 words across 1 study · Sources reviewed this edition

Coral

A biogenic skeletal material examined through Mediterranean red coral.

1,265 words across 1 study · Sources reviewed this edition

Brazilianite

A sodium aluminium phosphate with recorded crystals.

1,139 words across 1 study · Sources reviewed this edition

Diaspore

An aluminium oxyhydroxide with orthorhombic structure and brittle behaviour.

1,180 words across 1 study · Sources reviewed this edition

Garrard

Royal commissions, cluster settings and trophy making in a bounded house portrait.

1,191 words across 1 study · Sources reviewed this edition

Azza Fahmy

A founder’s path, workshop techniques and lettering in selected jewellery designs.

1,356 words across 1 study · Sources reviewed this edition

Hemmerle

Workshop practice, archived patterns and named projects in a bounded house portrait.

1,305 words across 1 study · Sources reviewed this edition