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Tag: gemstone

Gemstone Each Month Series (GEMS) – Emerald for May

by JewelStruck on May.08, 2010, under GEMS

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The birthstone of May, Emerald has been chosen for Gemstone Each Month Series (GEMS) this month. We would be discussing about them this complete month, if you have anything to share on Emeralds do email us at info@jewelstruck.com. With this post showcasing very beautiful gold pendant from Spain, with table-cut emeralds and hung with an emerald drop. Its currently been exhibited at Victoria and Albert Museum.

http://upload.wikimedia.org/wikipedia/commons/thumb/7/74/Spanish_jewellery-Gold_and_emerald_pendant_at_VAM-01.jpg/450px-Spanish_jewellery-Gold_and_emerald_pendant_at_VAM-01.jpg

Spanish Jewellery gold & emerald pendant

Lets get started with some quick facts on Emeralds for the first part of this series.

  • Emeralds are a variety of the mineral beryl, having green colour caused by trace amounts of chromium and sometimes vanadium.
  • Sometimes they have shades of blue and yellow, it looses color on prolonged heating.
  • Emerald hardness ranges from 7.5 to 8 on the Mohs scale.
  • The word “Emerald” is derived from Vulgar Latin: Esmaralda/Esmaraldus, a variant of Latin Smaragdus, which originated in Greek.
  • As we have said before, its birtstone of May and in some cultures emerald is considered traditional gift for the 55th wedding anniversary.
  • The “Gachala Emerald” is one of the largest emeralds in the world at 858 carats. This stone was found in 1967 at Vega de San Juan mine, Columbia.

So these were some facts on Emeralds, we would be back with more on Emeralds in coming posts of GEMS series this month.

Image credit:- Junho Jung

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Gemstone Each Month Series (GEMS) – Diamond for April

by JewelStruck on Apr.16, 2010, under GEMS

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Diamond, also the birthstone of April month, has been chosen for Gemstone Each Month Series (GEMS) this month. Being one of the best known and most sought after gem, there is a lot to explore on Diamonds. We would try our best to cover as much as possible of it. So lets get started with some quick facts on Diamonds for the first part of this series.

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The Hope Diamond

  • A chemically pure and structuraly perfect diamond is transparent (colourless), but diamonds can be found in many other colours too.
  • Being the hardest substance on earth (10 on Mohs scale) and having  characterstic properties like – high dispersion of light, makes it desirable to be used for many applications other than jewelry too. About 75% of worlds mined Diamonds are not suitable for Jewelry.
  • Most famous use of Diamonds is in Engagement rings. It has been used to symbolize engagements since 15th century.
  • The largest ever found Diamond was Cullinan at 3,106 carats.
  • Most of diamonds are atleast 1-3 billion years old, and they are found more than 100 miles below the earth.
  • Thermal conductivity of Diamonds is higher than other colorless gemstone, and is four times higher than copper.

So these were some quick facts on Diamonds. You will find us exploring more with details soon in coming days. If you have anything to share on Diamonds, do email us at – info@jewelstruck.com

Image credit – dbking

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Gemstone Each Month Series (GEMS) – Aquamarine for March

by JewelStruck on Mar.16, 2010, under GEMS

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Aquamarine has been chosen as Gemstone Each Month Series (GEMS) for March. So we would be discussing about it in detail this complete month. Its the birthstone for March and also with the summers approaching, knowing about this cool blue stone would definitely help you  :-). So lets get started with some quick facts on Aquamarine for the first part of this series.

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Aquamarine Seahorse Teardrop Gold Earrings by ShadowMoonDesigns

  • Aquamarine is blue or to be more correct turqoise variety of beryl (beryllium aluminium cyclosilicate)
  • It is named after a latin phrase – “Water of the sea”
  • It’s hardness ranges from 7.5-8 on Mohs scale and refractive indes from 1.57-1.58
  • Madagascar was first source for Aquamarine, though Brazil produces most of it today.
  • It’s the official state gem of Colorado, USA
  • It is often heat treated to make it pure blue and remove the green tint.
  • And as stated above too, its the birthstone for March.

Here were few quick facts on aquamarine, more will be coming sooner. If you have anything to share on Aquamarine, please do email us on info@jewelstruck.com.

Image credit :- ShadowMoonDesigns

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GEMS January – Mines and Types of Garnet

by JewelStruck on Jan.20, 2010, under GEMS

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Here we are, with another post in Gemstone Each Month Series (GEMS) on Garnets, for the month of January. We did some research on the mines and types of garnet, would be discussing the same in this post.

Garnets are usually mistaken as a single gem, but it is actually a family of gems. They are found all over the world including Latin America, Africa, India, Australia, Asia and some parts of Europe. The most common color of garnets is reddish brown whereas the most prized garnet is an emerald green variety called demantoid and is a member of the adradite group. Garnets are many a times found in the streams where metamorphic rock has eroded and left crystals for collection.

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Pendant in uvarovite, a rare bright-green garnet

Types of Garnet used as gems are –

  • Pyrope – (from the Greek pyrōpós meaning “fire-eyed”) is red in color and chemically a magnesium aluminium silicate, though the magnesium can be replaced in part by calcium and ferrous iron. The color of pyrope varies from deep red to almost black. Transparent pyropes are used as gemstones. A variety of pyrope from Macon County, North Carolina is a violet-red shade and has been called rhodolite, from the Greek meaning “a rose.” In chemical composition it may be considered as essentially an isomorphous mixture of pyrope and almandine, in the proportion of two parts pyrope to one part almandine. Pyrope is an indicator mineral for high-pressure rocks.
  • Almandine –  sometimes incorrectly called almandite, is the modern gem known as carbuncle. The name Almandine is a corruption of Alabanda, a region in Asia Minor where these stones were cut in ancient times. Chemically, almandine is an iron-aluminium garnet, the deep red transparent stones are often called precious garnet and are used as gemstones (being the most common of the gem garnets).
  • Spessartine Spessartine or spessartite is manganese aluminium garnet. Its name is derived from Spessart in Bavaria. It occurs most often in granite pegmatite and allied rock types and in certain low grade metamorphic phyllites. Spessartine of an orange-yellow is found in Madagascar. Violet-red spessartines are found in rhyolites in Colorado and Maine.
  • Grossular – Grossular is a calcium-aluminium garnet, though the calcium may in part be replaced by ferrous iron and the aluminium by ferric iron. The name grossular is derived from the botanical name for the gooseberry, grossularia, in reference to the green garnet of this composition that is found in Siberia. One of the most sought after varieties of gem garnet is the fine green grossular garnet from Kenya and Tanzania called tsavorite. This garnet was discovered in the 1960s in the Tsavo area of Kenya, from which the gem takes its name.
  • Andradite – is a calcium-iron garnet, is of variable composition and may be red, yellow, brown, green or black. The recognized varieties are topazolite (yellow or green), demantoid (green) and melanite (black). Andradite is found both in deep-seated igneous rocks like syenite as well as serpentines, schists, and crystalline limestone. Demantoid has been called the “emerald of the Urals” from its occurrence there, and is one of the most prized of garnet varieties. Topazolite is a golden yellow variety and melanite is a black variety
  • Uvarovite – Uvarovite is a calcium chromium garnet. This is a rather rare garnet, bright green in color, usually found as small crystals associated with chromite in peridotite, serpentinite, and kimberlites. It is found in crystalline marbles and schists in the Ural mountains of Russia and Outokumpu, Finland. Uvarovite crystals are generally too small to facet and are left attached to a matrix and incorporated into jewelry.

So those were the six major types of Garnets. Hope you got enjoyed reading this post, if you would like to contribute or share anything on Garnets do email us at info@jewelstruck.com.

References – Wiki

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Gemstone Each Month Series (GEMS) January – Garnet quick facts!

by JewelStruck on Jan.06, 2010, under GEMS

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Garnet finally is chosen for Gemstone Each Month Series (GEMS), January. As it is also the BirthStone for this month.  So many things coming up lately had delayed this announcement. Anyways better late than never, we would start of with quick facts on Garnet (yeah, as always!)

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Anglo-Saxon sword hilt fitting, gold with gemstone inlay of garnet cloisonne

  • Name originates from pomegranate seed or granatum, with similar color
  • Though most common color for garnet is reddish brown, but its found in a virtual rainbow of colors
  • These are group of common silicate minerals which have similar crystal structure & chemical composition
  • Garnet’s are one of most ancient gems used, traced to the Nile Delta in 3100 B.C
  • It is Gemstone for January, also called New York’s Gemstone
  • It has got great Geological importance, been used for interpreting the genesis of many igneous and metamorphic rocks

Thats just to start with, keep watching this series to know more about garnet.  If you have something to share on Garnets, please do email us at info@jewelstruck.com. Your contribution would be credited and we would be thankful to you for helping us out :-)

Image credit –  portableantiquities

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