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November 01, 2019
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The most expensive color topaz are rich Pink or Red Topaz, followed by rich Orange Topaz. These vivid colors (red, pink, and orange) can cost excess of $1500/ct in contrast with the blue topaz (commonly treated) that is available by not more of $60/ct. Blue Topaz is affordable gemstone.
White or Colorless Topaz is an affordable gemstone. It's ideal for jewelry, its hardness (8 Mohs Scale), transparency, brilliance and its low price, make this white gemstone an affordable choice for your jewels.
Blue topaz is cut into any style and size.
Blue Topaz is available in large sizes, however Red and Pink Topaz are common small sizes.
Biphasic and Triphasic inclusions with immiscible liquids, veils, fingerprints or feathers. Solid inclusions (hematite, fluorite, etc). Solid inclusions finished “comet tail”. Needle-like rutile inclusion. Straight lines of growth.
Topaz occurs most commonly in pegmatites, granites and rhyolites (igneous rocks). Also it is found in secondary deposits (alluvial).
Afghanistan, Brazil (Ouro Preto–Minas Gerais), Burma (Myanmar), Canada, China, Kazakhastan, India, Madagascar, Mozambique, Namibia, Pakistan, Russia, Sri Lanka, Tajikistan, Ukraine, USA, Vietnam, Zimbabwe…
Topaz and Citrine are the birthstones for November. The Blue Topaz is the gem gifted for 4th wedding anniversaries, and the Imperial Topaz is gifted for those celebrating their 23rd anniversary.
More information about Birthstones.
Make us stronger, restore the soul, dispel anger, break spells, remove insomnia, longer life, are some of the legends that have been attributed to the topaz for centuries.
Irradiation + heat treatment: Colorless topaz is irradiated, brown topaz are obtained. This brown topaz is subjected to a thermal treatment that removes the brown component, obtaining blue topaz. This blue color is stable to light.
Irradiation: Colorless topaz is irradiated turning it brown topaz, the color is unstable (exposure to sunlight).
Heat Treatment: Orange-brown topaz is treated to turning it Pink - Purple Topaz. (Natural pink topaz is rare)
Coating: It consists of a thin layer deposition (microns) on the topaz. This deposition may be a dye to impart color or change its color.
Also can be the deposition of a metallic material so that we get an iridescent topaz.
This topaz is known by the name "Mystic Topaz" - "Rainbow Topaz". This thin layer is delicate, is easily scratched. Coating is not permanent.
Citrine, Smoky Quarz, Glass
Solid inclusions with "comet tail"
Aluminium silicate that contains fluorine and hydroxyl. Al2 (F,OH)2 SiO4
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June 17, 2020
Thoughts alouds of a gemologist about gems scams, the relationship that we humans have with gems and jewels, and of course, about feelings.
May 11, 2020
Lo primero que buscamos en las piedras preciosas es su belleza. Pero la belleza es subjetiva y es muy difícil de clasificar.
Una cosa que he aprendido con el tiempo es que cuando se venden piedras preciosas sueltas, los compradores suelen ser coleccionistas de gema o bien van a usar la gema para hacerse una pieza de joyería a medida; un anillo de compromiso, de boda, o algo muy especial. En cuyo caso tienen clarísimo el color que están buscando.
May 09, 2020
The first thing we look for in precious stones is their beauty. But beauty is subjective and is very difficult to classify.
One thing I have learned over time is that when loose gemstones are sold, the buyers are often gem collectors or they will use the gem to make a custom piece of jewelry; an engagement ring, a wedding ring, or something very special. In which case they are very clear about the color they are looking for.