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Blue topaz is the state gemstone of the US state of Texas. [25] The 4th wedding anniversary gem is blue topaz and the 23rd is imperial topaz. [22] Synthetic topaz can be produced using a method that includes the thermal hydrolysis of SiO 2 and AlF 3. [26] When these compounds are heated to temperatures of 750° to 850 °C topaz is formed.
A number of individual gemstones are famous in their own right, ... most expensive pearl of all time; Rubies ... a 5,899.5-carat (1.17990 kg) cut topaz. Tsavorite
Gemstones of the World revised 5th edition, 2013 by Walter Schumann ISBN 978-1454909538 Smithsonian Handbook: Gemstones by Cally Hall, 2nd ed. 2002 ISBN 978-0789489852 hide
18. Platinum. Cost: $33.02 per gram Platinum is a beautiful precious metal that is in a similar category as gold and silver. All three of these metals are frequently traded in the global markets ...
Shane & Co. offers free resizing and a warranty for life as well as free cleanings and lost stone replacements. $1625.00 at Shane & Co. 5.02ct East-West Cushion Diamond Button Back Ring
Even though it is a tourmaline, Paraiba Tourmaline is one of the most expensive gemstones. [31] Grading ... Virtually all blue topaz, both the lighter and the darker ...