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Friday 28 November 2014    Sherry Jewellery - Bespoke jewellers - Unique designs - Diamond ring specialists

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Multi coloured gems

Bi tourmaline:   Tourmaline is a gem found in multi-colours. It’s one of those gems designated according to colour. The Bi colours are numerous in shade variations and fascinating. Probably the most common colour mixes are deep pink, merging to dark green, but you can also get pinky oranges, changing through yellow, to green. Some of the paler shades are termed ‘water melon’ tourmalines. They’re a particular favourite with designer-makers. The pinkish to red specimens are known as Rubellite which is considered to be the most valuable colour.   (We have a bi-colour pendant for sale at the moment.)
  • Deposits found in Africa, Brazil, Sri Lanka
  • Mohs hardness scale: 7 - 7.5   Mohs scale

Alexandrite:   Alexandrite was named after the Russian Czar, Alexander ll. They are from the same mineral group as Chrysoberyl. They’re generally thought of as a collectors’ stone and rarely found set in modern jewellery. The best examples change colour from vivid bluish green in daylight, to a purplish red in artificial light. It is considered the rarest and most valuable of all gem stones. In the 1980s, deposits were discovered in Brazil, though Russian alexandrite is still thought to be more superior, for its colour changing qualities. 
  • Deposits are also found in India, Burma and Africa.
  • Mohs hardness scale: 8.5    Mohs scale

Rose Quartz:   Rose Quartz belongs in the same family as the Ametrine and Amethyst group. Rose quartz is often a very pale pink. Some quartz can be variegated (as our example). The rose variety is readily available. Some believe that wearing quartz will assist in health and spiritual wellbeing. 
  • Deposits found in India, Brazil, Russia
  • Mohs hardness scale: 7    Mohs scale

Precious Opal:   This is one of the three different sorts of opal. The precious variety is known for its opalescent qualities, with a huge array of colour mixes. It was not until the 1960s, that mineralogists realised, that the colour change qualities were due to tiny (0.001mm diameter) spheres of cristobalite, suspended in siliceous jelly. Opals contain water; occasionally drying out completely, which results in the diminishment of their colour and sometimes, to cracking. It’s therefore considered to be less appropriate for everyday wear. In Europe, opals have developed the reputation for being unlucky, but this is only due to their tendency to crack, or shrink, thus falling out of their settings.
  • Deposits found in Australia, Brazil, Guatemala, Japan and USA (Nevada)
  • Mohs hardness scale: 5.5 – 6.5    Mohs scale


Particpant in the Kimberley Process Certification Scheme British Jewellery Association Member Registered with the Birmingham Assay Office Fellow of the Institute of Professional Goldsmiths
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