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Brewster Angle MeterPlacing a gem inside a Brewster Angle Meter. This instrument was introduced in 1999. This instrument can be used to find the refractive index (RI) of gems, which can help with identification
Opal doubletsOpals are not truely crystalline and are therefore mineraloids. They comprise of (hydrated silica glass)
Pink rubellite tourmalineChinese pendant carving in pink rubellite tourmaline
Emerald on calciteWell-formed hexagonal crystals of emerald on calcite. Emerald is a variety of beryl (beryllium aluminum silicate). The green colour is attributed to small amounts of chromium
TopazImage of Queen Victoria carved in topaz. Topaz comprises of (aluminum silicate fluoride hydroxide)
Almandine garnetsBrooch set with almandine garnets. Almandine comprises of (iron aluminum silicate) and is the most common of the garnets
Sapphire crystalSapphire is a blue variety of corundum, which is the second hardest natural substance known on Earth. Specimen originates from Olberg, Rheinland, now at the Natural History Museum, London
Ruby is a variety of corundum, which is the second hardest natural substance known on Earth. Specimen is originally from Aust-Agder, Norway, and is now on display at the Natural History Museum, London
BerylA specimen of beryl (beryllium aluminum silicate). There are several varieties of beryl, aquamarine (blue), emerald (green), goshenite, heliodor and morganite
Emerald, a variety of berylA cut teardrop stone and a prismatic crystal of the green variety of beryl (beryllium aluminum silicate) known as emerald. Specimen from the Natural History Museum, London
AlmanditeA 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
Amethyst is the purple variety of quartz (silicon dioxide) and is a popular gemstone
TourmalineA specimen of the mineral and gemstone tourmaline from Itambacury Theophilo Ottoni, Minas Gerais, Brazil
Benitoite cut stoneBenitoite was discovered in 1906 near the San Benito river in California which remains the only known locality for this (barium titanium silicate mineral)
Orange sapphireA rare Sri-Lankan hexagonal cut orange sapphire. Sapphires belong to the corundum group - the second hardest mineral group known
SinhaliteA 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
BerylFrom left to right, different varieties of berly (beryllium aluminum silicate) cut stone; emerald, aquamarine, morganite and heliodor
DiamondA form of carbon. The brilliant, hard diamond, is formed under conditions of vast pressure and heat deep wihtin the earth
Black Opal cabochonA specimen of black opal cabochon from Wallangulla, Queensland, Australia. Opal is not a single crystal, but is made up of tiny spheres of silica
Garnet
Cordierite variety IoliteIt is famous for its pleochroism, appearing intense blue in one direction but becoming almost colourless as the stone is turned. Cut stone, faceted girdle, 19.69 ct
Topaz crystalAn imperial topaz crystal from Brazil, length 101mm long. Topaz comprises of (aluminum silicate fluoride hydroxide)
Some crystal forms of carbonSeen 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
A large cut citrineCitrine is the yellow and orange variety of quartz (silicon dioxide). Specimen held at the Natural History Museum, London
Citrine and sapphireFine and poor examples of gem cutting and polishing. A superbly cut citrine (a yellow variety of quartz) and a poorly cut sapphire (blue), a variety of the mineral Corundum (aluminium oxide)
Fibrolite is an aluminium silicate. It is a rare variety of the mineral sillimanite. This stone from Burma shows blueish-violet and pale yellow pleochroic colours
Andalusite cut stoneAndalusite is an aluminium silicate. It shows spectacular red and green pleochroic colours
A group of feldspar specimensAmazonstone crystals and gems, pin set with sunstone, and moonstones. The feldpars are significant rock building minerals
Carved nephriteA tiki from New Zealand (left), a seal from British Colombia, and a Chinese vase all carved from nephrite. Nephrite is actually not a mineral outright, but is a variety of the mineral actinolite
Turquoise vein in shaleTurquoise (hydrated copper aluminum phosphate) vein in shale, from Victoria, Australia. Turquoise is perhaps the most valuable non-transparent mineral
A collection of turquoise specimensRough, polished and worked specimens of turquoise (Hydrated Copper Aluminum Phosphate). Turquoise is perhaps the most valuable of the non-transparent minerals
TurquoiseFour different examples of worked turquoise. Turquoise (hydrated copper aluminum phosphate) is perhaps one of the most valuable non-transparent minerals
Tourmaline crystalA bi-coloured pink and green tourmaline crystal from California
Demantoid garnet cut stoneDemantoid is a variety of andradite garnet. It is green in colour, sometimes with yellow shading
Faceted chrysoberylTwo cut stones of the gemstone chrysoberyl (beryllium aluminum oxide). This stone is also known as cats eyes
Brown and blue zirconsNatural brown and heat-treated blue zircons. Zircon comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona
Chrysoberyl cats eyesTwo stones of Chrysoberyl (beryllium aluminum oxide), illustrating the similarity the gemstone has with a cats eye
Zircon crystalZircon comprises of (zirconium silicate) and is not the same as the artificial gem cubic zircona. Specimen is from Norway
Garnet cut stonesGrossular (calcium aluminum silicate) and demantoid cut gems resting on andradite (calcium iron silicate) crystals. All of which are types of garnet
Quartz box and carved lizardAn ornamental box set with different quartz stones (silicon dioxide) including a large central citrine together with a carved lizard in cat s-eye quartz
Fluorescent groupA group including amber, ruby, ivory, fluorite and opal photographed in ultra violet light. See 179 for the same group in white light
The new excursion steamer Columbia: gem of the ocean. Date c1877. The new excursion steamer Columbia: gem of the ocean. Date c1877
England / WroxtonWroxton, Oxfordshire, a gem of the Cotswolds, a perfect village, with stone-built thatched cottages. Date: early 1960s
England / Rye 1939This beautiful half-timbered building in Mermaid Lane, Rye, Sussex, England, is the Old Hospital. A true gem of Old England which has slumbered throughout the centuries. Date: 1939
The Gem Variety Theatre and dance hall, pioneer days in Deadwood
Sappho (On a Gem)SAPPHO Greek poet
Gem FreezerTHE GEM FREEZER (American) is the best in the world - the maker says so !