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Tiffany Iris Diamond Brooch
Posted on September 7th, 2009 No commentsIf pure platinum is found in placer deposits or other ores it is isolated from them by various methods of subtracting impurities. Because platinum is significantly denser than many of its impurities, the lighter impurities can be removed by
simply floating them away in a water bath. Platinum is also non-magnetic, while nickel and iron are both magnetic. These two impurities are thus removed by running an electromagnet over the mixture. Because platinum has a higher melting point than most other substances, many impurities can be burned or melted away without melting the platinum. Finally, platinum is resistant to hydrochloric and sulfuric acids, while other substances are readily attacked by them. Metal impurities can be removed by stirring the mixture in either of the two acids and recovering the remaining platinum.This Iris brooch with yellow sapphires, tsavorites and diamonds in platinum is valued $38,000. Let we have a look at the specification of this elegant and captivating brooch in platinum with yellow sapphires, tsavorites, round brilliant diamonds and 18k gold. Yellow sapphires, carat total weight 20.06; tsavorites, carat total weight .81; round brilliant diamonds, carat total weight .60.
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Tiffany Magic Starfish Brooch
Posted on September 7th, 2009 No commentsPlatinum exists in higher abundances on the Moon and in meteorites. Correspondingly, platinum is found in slightly higher abundances at sites of bolide impact on the Earth that are associated with resulting post-impact volcanism, and can be mined economically; the Sudbury is one such example. Platinum together with the rest of the platinum metals is obtained commercially as a by-product from nickel and copper mining and processing. During electrorefining of copper , noble metals such as silver, gold and the platinum group metals as well as selenium and tellurium settle to the bottom of the cell as anode mud, which forms the starting point for the extraction of the platinum group metals.
This magical starfish is encrusted with pink opals, sapphires and diamonds that shimmer like the sand and the sea. The specifications are like this: Cabochon pink opals, carat total weight .43; cabochon pink sapphires, carat total weight .83; round brilliant diamonds, carat total weight 2.85. This beautiful starfish brooch values $22,000.