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Saturday 1 November 2014    Sherry Jewellery - Bespoke jewellers - Unique designs - Diamond ring specialists

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Blue & purple gems

Sapphire:  Sapphire is from the corundum group of minerals. Its colours range from yellow, orange, pink, green, purple, to blue. All reds are designated as Rubies. There is no definite demarcation between sapphires and rubies, so light reds, pinks or violets are termed sapphires The most desirable and valuable colours are the cornflower blues.
  • Deposits in Sri Lanka, Burma, Brazil, Thailand, Africa and Australia
  • Mohs hardness scale: 9     Mohs scale

Aquamarine:  Aquamarine part of the beryl family of gems and therefore closely related to Emerald. The darker blue green colour is thought to be the more desirable. The preferred cut is emerald or scissor cut, along with long oval shapes. Can sometimes be mistaken with Topaz.
  • Deposits found on all continents: Russia, Brazil Sri Lanka, North America,
  • Mohs hardness scale: 7.5-8        Mohs scale

Tourmaline: Tourmaline is a gem found in multi-colours. It’s one of those gems designated according to colour; in this case it’s called Indicolite, available in every shade of blue. Most have a hint of green, and pure blues are expensive, generally being collectors’ stones. They are sometimes referred to as Paraiba Tourmalines. Recently, new sources have been discovered in Africa.
  • Deposits in mainly in Brazil and Nigeria   
  • Mohs hardness scale: 7 - 7.5       Mohs scale

Starlite:  Starlite is a heat treated zircon. Often confused with Cubic zirconia (synthetic diamond lookalike) Natural zircons do occur colourless and were a popular substitute for a diamonds, this is where the confusion has arisen. Zircons also occur in yellow and reds (Hyacinth). Green zircons are rare, often sought after by collectors.
  • Deposits in Burma, Thailand, Australia, Africa, France, Sri Lanka
  • Mohs hardness scale: 6.5 - 7.5   Mohs scale

Tanzanite: Tanzanite was originally known as blue Zoisite, but was rebranded in the 60s, by New York Jewellery company Tiffany & Co. (because the word Zoisite, was said to sound a little too like the word Suicide) The new name quickly caught on in the trade. Tanzanite is characterized by its blue to purple colour
  • Deposits from one source only Tanzania.
  • Mohs hardness scale: 6.5 - 7     Mohs scale

Iolite:   Iolite comes from the Greek word ‘ion’ meaning violet. Iolite is also referred to as cordierite and dichroite. Thin slivers of it were used by the Vikings for navigation. They used its polarising qualities to help mark the position of the sun on their various conquests across the seas. The richer blues are more desirable. Iolite is inexpensive and readily available.
  • Deposits in Sri Lanka, India, Burma, Brazil, Africa
  • Mohs hardness scale: 7 - 7.5       Mohs scale

Amethyst:    They belong to the quartz group and are classed as semi-precious. Amethyst is regarded as the most valuble of the quartz Family .They are often confused with beryl, Kunzite and topaz.. Some people believe that amethysts have supernatural powers regarding health and wellbeing.
  • Deposits found in Brazil, US Spain, Russia, France.
  • Mohs hardness scale: 7     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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