*Please note all loose gemstones are sold on behalf of a third-party wholesaler and pricing is therefore linked to the US$. Regular price updates are performed in order to accommodate fluctuations in the exchange rate and may be carried out without prior notice. Dispatch on loose gemstones will take place 2 working days after purchase to allow for shipping from the supplier to my studio. I do regular inventory updates with them to ensure accuracy, but since these stones are also offered for sale to other jewellery designers, it may happen that a particular stone is no longer available at the time of purchase. In such a case you will receive the opportunity to change your order or a full refund.
This lovely 15.79 carat natural topaz has a lovely dark blue colour.
Topaz is the official November birthstone, as well as the 4th (blue) and 23rd (Imperial) wedding anniversary stone.
Weight: 15.79 carat
Cut: Mixed cut
Colour: Dark blue
Length: 17.98 mm
Width: 13.18 mm
Depth: 9.03 mm
Origin: Brazil
Treatment: Heat
Certificate: No – Can be certified at an extra charge.
About Topaz:
Species: Topaz
Deposits found in: Brazil (Minas Gerais), Afghanistan, Australia, Burma, China, Japan, Madagascar, Mexico, Namibia, Nigeria, Pakistan, Russia (the Urals, Transbaikalia), Zimbabwe, Sri-Lanka and the USA. Stones with a natural light blue colour are mined in Northern Ireland, Scotland and Cornwall in England.
Known colours: Brown, or yellow with a reddish tint is the most common naturally occuring colour of topaz. Topaz also occurs naturally in colour ranges from pink to red, yellow to orange, blue to green, and colourless.
Mohs Hardness: 8
Although this has not been conclusively proven, topaz is said to take its name from the island Zabargad, formerly known as Topazos, the site of the oldest known peridot mine. The pink to red colour range tends to be more expensive than the other colour ranges, but when a stone in the yellow to orange range is intensely coloured and has a pink or reddish overtone, the stone is referred to as imperial topaz, which is the most expensive variety.
Naturally coloured blue topaz does occur, and due to its rarity was historically considered one of the most expensive colours, in particular the London blue, which is a very dark, velvety blue. This lasted until the discovery was made that colourless or weekly coloured brown topaz could be treated with heat or irradiated to produce a variety of blues. Ever since, artificially coloured blue topaz has dominated the market, and sky blue has become the colour most customers associate with this gem.
Topaz is quite hard, and therefore its colourless varieties make excellent diamond alternatives in designs that call for large white stones.
Topaz is sensitive to chemicals and heat, especially exposure to sunlight, and care should be taken when storing this gem to avoid changes in colour and appearance.
<em>Please note: We take great care to ensure that the photographs are an accurate representation of the actual stone, but due to differences in screen quality and resolution, and the fact that the colour of a gemstone is dependent on the type of light it is viewed in, some variation is possible.
Stock Code: RM819106
