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Bangles are circular in shape, and, unlike other bracelets, are not flexible. The word is derived from Hindi bungri (glass). [ 3 ] They are made of numerous precious as well as non-precious materials such as gold , silver , platinum , glass , wood , ferrous metals , plastic , etc. Bangles made from sea shell, which are white colour, are worn by ...
As of 2022, the global jewelry market was valued at approximately $270 billion and is projected to grow to over $330 billion by 2026. In 2022, the leading countries in the jewelry and watch market revenue were China, India, and the United States. [87] The global jewellery market was valued at USD 278.5 billion in 2018.
Selenite, satin spar, desert rose, and gypsum flower are crystal habit varieties of the mineral gypsum.. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O. Selenite contains no selenium, the similar names both derive from Greek selḗnē (σελήνη 'Moon').
Selenium is toxic in high concentrations. As sodium selenite, the chronic toxic dose for human beings was described as about 2.4 to 3 milligrams of selenium per day. [7] In 2000, the US Institute of Medicine set the adult Tolerable upper intake levels (UL) for selenium from all sources - food, drinking water and dietary supplements - at 400 μg/day. [8]
In 1889, Tiffany and Co. introduced their first charm bracelet — a link bracelet with a single heart dangling from it, a bracelet which is an iconic symbol for Tiffany today. [citation needed] Despite the Great Depression, during the 1920s and 1930s platinum and diamonds were introduced to charm bracelet manufacturing.
The element selenium exhibits several valence states. Selenate is the least reduced, followed by selenite, and elemental selenium; selenide is even more reduced than elemental selenium. [6] The valence state is an important factor to the toxicity of selenium. Selenate is the form required by organisms that need selenium as a micronutrient.
Selenite refers to the anion with the chemical formula Se O 2− 3. It is the oxyanion of selenium. It is the selenium analog of the sulfite ion, SO 2− 3. Thus selenite is pyramidal and selenium is assigned oxidation state +4. Selenite also refers to compounds that contains this ion, for example sodium selenite Na 2 SeO 3 which is a common ...
It can also be prepared by a precipitation reaction between silver nitrate and sodium selenite: [2] Another method is the reaction between selenium and silver nitrate: [ 3 ] 3 Se + 6 AgNO 3 + 3 H 2 O → 2 Ag 2 Se + Ag 2 SeO 3 + 6 HNO 3