SKY BLUE TOPAZ

Topaz is named from Greek "topazion" for a type of gemstone, probably after Sanskrit "tapas" - fire, alluding to the brilliance of gem-quality material. Topaz has been known from antiquity.

Blue Topaz does occur in nature, but is rare and almost always light color. Colorless or lightly colored topaz goes through processes that create the blue color. Among the colours thus created, lighter blue are known as Sky Blue topaz.

Topaz Treatments:-

                                  Irradiation followed by heat-treatment produces most blue colors. Irradiation also produces yellow, orange, red, brownish, pinkish and greenish colors: often unstable, may fade upon direct exposure to sunlight. Coated entirely or partially: may show peeled coating at facet junctions, iridescence (reflecting light), spotty coloration. Some surface-treatments are removed only with acids (mostly green and blue) - Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 5

Significant Gem Localities:- 

 Mined in Brazil, Pakistan, Afghanistan, India, China, Burma, Sri Lanka, Japan, Russia, Ukraine, Australia, Madagascar, Namibia, Nigeria, Zimbabwe, Mexico, U.S. 

Hardness of 8 

WEIGHT PER PIECE OF SKY BLUE TOPAZ
OVAL SHAPE		OCTAGON SHAPE		PEAR SHAPE		ROUND SHAPE		SQUARE SHAPE
SIZE	WEIGHT	SIZE	WEIGHT	SIZE	WEIGHT	SIZE	WEIGHT	SIZE	WEIGHT
5*3MM	0.37	5*3MM		5*3MM		3MM	0.13	3*3MM	0.19
5*4MM	0.43	6*4MM	0.72	6*4MM	0.47	4MM	0.35	4*4MM	0.44
6*4MM	0.59	7*5MM	1.3	7*5MM	0.88	5MM	0.55	5*5MM	0.94
7*5MM	0.94	8*6MM	1.86	8*5MM	1.05	6MM	1.02	6*6MM	1.4
8*6MM	1.14	9*7MM	2.74	8*6MM		7MM	1.5	7*7MM	2.18
9*7MM	2.12	10*8MM	4.17	9*6MM	1.67	8MM	2.31	8*8MM
10*8MM	3.13	11*9MM	7.61	10*7MM	2.38	9MM		10*10MM
11*9MM	4.4	12*10MM	11.23	12*8MM	3.75	10MM
12*10MM		14*10MM
14*10MM