Birthstone Collection (page 2)

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

Diamond with garnet
Red garnet crystal in an octagonal, step-cut diamond. Diamond comprises of compacted carbon and is the hardest natural substance known on Earth

Peridot group
Fine cut peridot of 146 carats (centre) with crystals and rough mass (right) from Zebirget, and Hawaiian basalt containing olivine crystals (left)

Star rubies and sapphires
Star stones of ruby and sapphire, both are varieties of the mineral corundum (aluminium oxide). Ruby always appears in red where as sapphire comes in a variety of colours

Ruby and Sapphire cut stones

Ruby
A six-rayed star ruby. Ruby is the red variety of the mineral corundum (aluminium oxide)

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

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

Imitation turquoise
A slab of imitiation turquoise. True specimens of turquoise are among the most valuable non-transparent minerals

Beryl
From left to right, different varieties of berly (beryllium aluminum silicate) cut stone; emerald, aquamarine, morganite and heliodor

Garnet

Topaz crystal
An imperial topaz crystal from Brazil, length 101mm long. Topaz comprises of (aluminum silicate fluoride hydroxide)

A group of feldspar specimens
Amazonstone crystals and gems, pin set with sunstone, and moonstones. The feldpars are significant rock building minerals

Turquoise vein in shale
Turquoise (hydrated copper aluminum phosphate) vein in shale, from Victoria, Australia. Turquoise is perhaps the most valuable non-transparent mineral

A collection of turquoise specimens
Rough, polished and worked specimens of turquoise (Hydrated Copper Aluminum Phosphate). Turquoise is perhaps the most valuable of the non-transparent minerals

Turquoise
Four different examples of worked turquoise. Turquoise (hydrated copper aluminum phosphate) is perhaps one of the most valuable non-transparent minerals

Garnet cut stones
Grossular (calcium aluminum silicate) and demantoid cut gems resting on andradite (calcium iron silicate) crystals. All of which are types of garnet

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