Скачать или смотреть Katlang Topaz cutting

Topaz from 
Katlang, Mardan District, Khyber Pakhtunkhwa (North-West Frontier Province), Pakistan

Origin: Katalng Mardan Pakistan. Maximum size 200 gram, Minimum 1 carat. total weight 1900 gram. Quality mix the small pieces are mostly eye clean rest of the bigger pieces are some inclusion and cracksA terminated imperial topaz crystal on a marble matrix, from Katlang.  These are considered to be among the most collectible Pakistani topazes (especially when pink-- though this one is orange) and frequently command a premium over examples from other Pakistani localities, even as faceted stones.The "imperial" topazes from Katlang bear a resemblance to examples from Ouro Preto, Brazil, though differ from the Brazilian examples in that they are more often seen on matrix.Topaz actually has an exceptionally wide color range that, besides brown, includes various tones and saturations of blue, green, yellow, orange, red, pink, and purple. Colorless topaz is plentiful, and is often treated to give it a blue color. Topaz is also pleochroic, meaning that the gem can show different colors in different crystal directions.BIRTHSTONES & ANNIVERSARIES

Precious topaz is a birthstone for November and blue topaz is a birthstone for December. Blue topaz is the gem of the 4th anniversary and Imperial topaz is the gem of the 23rd anniversary.

1768

The royal court in Portugal celebrates the discovery of Imperial topaz in 1768.

271 KILOS

A transparent topaz crystal discovered in Minas Gerais, Brazil weighs an astounding 596 pounds.

10 MEV

Irradiating colorless topaz with electrons at energy of 10 million electron volts creates a sky blue color.

FACTS

Mineral: Topaz
Chemistry: Al2(F,OH)2SiO4
Color: Yellow, orange, brown, pink to red to purple red, blue , light green and colorless
Refractive index: 1.619 to 1.627
Birefringence: 0.008 to 0.010
Specific gravity: 3.53
Mohs Hardness: 8

TREATMENTS

There are a number of processes used to alter the color, apparent clarity, or improve the

Myself Fazlu Ur Rehman gemstone cutter i want to show the PAKISTANI talents to tha world