Facet Collection

Beryl
A cut heliodor beryl stone of 135.93 carats. Beryl comprises of beryllium aluminum silicate

Cinnabar
Twinned dark red cinnabar crystals with small quartz crystals. Cinnabar comprises of (mercury sulphide). Specimen from the Natural History Museum, London

Garnet-topped doublet
A green garnet-topped doublet. Garnets are common in metamorphosed rocks and also in some igneous formations

Tanzanite crystal and cut stone
This is a blue variety of the mineral zoisite. Strongly pleochroic, it displays rich blue, magenta and yellowish-grey colours when viewed from different angles

Topaz comprises of (aluminum silicate fluoride hydroxide). This is a specimen from the collections of the Natural History Museum, London

Cassiterite
A dark-brown single crystal of cassiterite among quartz. Cassiterite comprises of (tin oxide) and forms ornately faceted crystals with high lustre. Specimen from Turnavore mine, St. Agnes, Cornwall

Diamond crystals
Clockwise from top left (yellow matrix): in beach conglomerate from Namaqualand, in kimberlite from South Africa and in matrix from Siberia (bottom)

Anatase
A brown to black single tetragonal crystal of anatase (titanium oxide). Anatase is a polymorph of rutile and brookite, meaning they carry the same chemistry, but with a different structure

Jet ornament is similar to amber in texture and to coal in appearance. Jet is fossilised timber of a variety of Araucaria - similar to todays monkey puzzle trees

Emeralds
Emerald is a variety of beryl (beryllium aluminum silicate). The green colour is attributed to small amounts of chromium. Specimens from the Natural History Museum, London

Gemstone series: sapphire
Sapphire, the blue variety of the mineral corundum (aluminium oxide). Sapphire can be found in a number of different colours. Specimen at the Natural History Museum, London

Birthstone Series: Blue Topaz

Birthstone Series: Topaz
Topaz has a chemical composition of aluminum silicate fluoride hydroxide and is the birthstone for the month of November (along with Citrine). Photographed by Frank Greenaway

Birthstone Series: Aquamarine
Aquamarine is the blue variety of beryl (beryllium aluminum silicate) and is the birthstone of the month of March. A gemstone from the Natural History Museum collections, in London

Birthstone Series: Garnet
Garnet has a chemical composition of iron aluminium silicate. It is the birthstone of the month of January. Gemstone from the Natural History Museum collections, in London

Chrysoberyl
Shown here is a crystal and a cut stone of chrysoberyl (beryllium aluminum oxide). Chrysoberl is a gemstone and is also known as cats eye

Citrine and amethyst are both varieties of quartz (silicon dioxide)

Garnets
Faceted garnets showing a range of colours. Garnet is the birthstone of January

Kunzite crystal and cut stone
Strongly dichroic pink kunzite crystal and faceted kunzite. Kunzite (lithium aluminum silicate) is the pink variety of spodumene and is pleochroic

Zircons
Faceted zircons showing various colours and high lustre, from Sri Lanka. Zircon comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona

Topaz
Blue irradiated topaz pebbles and faceted topaz. Topaz is comprised of (aluminum silicate fluoride hydroxide)

Imitation emerald
A faceted teardrop synthetic emerald

Almandite
A crystal and a cut stone of almandite, a deep red garnet comprised of (iron aluminum silicate). Specimen from the collections of the Natural History Museum, London

Benitoite cut stone
Benitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this (barium titanium silicate mineral)

Orange sapphire
A rare Sri-Lankan hexagonal cut orange sapphire. Sapphires belong to the corundum group - the second hardest mineral group known

Sinhalite
A round mixed cut of 15.5 carats. Silhalite comprises of (magnesium aluminum borate) and only known to derive from the gem gravels of Sri Lanka

Some crystal forms of carbon
Seen here are rough diamonds or boarts surrounding a diamond crystal which have been photographed on a base of graphite. Diamond is the hardest known mineral on Earth

Kornerupine (magnesium aluminum iron boro-silicate hydroxide) is a rare boro-silicate mineral which occurs in a range of greens and browns - this emerald colour is exceptional

Demantoid garnet cut stone
Demantoid is a variety of andradite garnet. It is green in colour, sometimes with yellow shading

Faceted chrysoberyl
Two cut stones of the gemstone chrysoberyl (beryllium aluminum oxide). This stone is also known as cats eyes

Zircon crystal
Zircon comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona. Specimen is from Norway

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