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匿名 發問於 科學及數學化學 · 1 十年 前

1000 platinum in the world?

One jewellary shop (named Just XX) in HK stated that only they have 1000 (PT100) platinum wedding ring. But all other jewellary shops said that it is impossible to have pure platinum, and platinum is PT95 nowadays. Would you pls advise whether it is possible to PT100 pure platinum in the world now?

更新:

And what is the purity level of platinum for jewellary nowaday?

1 個解答

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  • Carson
    Lv 6
    1 十年 前
    最佳解答

    1000 platinum seems impossible

    ppt = parts per thousand

    Examples of markings or descriptions for products containing platinum that may be misleading:

    (1) Use of the word "Platinum" or any abbr, without qualification, to describe all or part of any industry product that is not composed throughout of 950 ppt pure Platinum.

    (2) Use of the word "Platinum" or any abbr accompanied by a number indicating the ppt of pure Platinum contained in the product without mention of the number of ppt of other PGM contained in the product, to describe all or part of an industry product that is not composed throughout of at least 850 ppt pure platinum, eg, "600Plat."

    (3) Use of the word "Platinum" or any abbr therefore, to mark or describe any product that is not composed throughout of at least 500 ppt pure Platinum.

    Most metals used for jewelry making are mixed with other alloys. For example, sterling silver contains other metals such as copper and zinc. Silver and copper are mixed with gold. This mixing of metals is done for a variety of reasons: it will strengthen soft metals; it will lower the metal's melting point; it will change the color of the metal; and it will make metals more affordable. This last reason is why the US federal govt has determined specific standards for different types of metals. When determining the proper karat of gold, the following is considered the standard:

    - 24kt: 100% gold

    - 18kt: 75% gold

    - 14kt: 58% gold

    - 12kt: 50% gold

    Sterling silver is .925 silver, and fine silver is .999 pure silver.

    In the past, most platinum jewelry was about 85% pure platinum, or per the Federal Trade Commission (FTC) to be called platinum, jewelry must be made up of 850 ppt. However, we all know how popular this white metal has become. It is a favorite now for wedding bands and engagement rings. It is a status symbol for music industry celebrities. But it is also very, very expensive. Lots of jewelry lovers want it but few can afford it.

    Maybe that is why there is a movement now to change the current FTC platinum standards. According to an article published by National Jeweler (FTC seeks Comment on .585 Platinum), "Several manufacturers have recently brought .585 platinum jewelry to market, raising questions regarding the use of the word "platinum" in selling the jewelry, as well as how the material is presented to consumers." The article goes on to say that there is a task force that is looking into this, and eventually, this could change the current standards for identifying platinum jewelry.

    I know most small jewelry makers and designers cannot often afford to work with platinum, but it is still important to be aware of changes in the world of jewelry making. Also, if lower "karats" of platinum become available, this could mean more opportunities to work with this metal.

    Platinum Marks

    Jewelry can contain different percentages of pure platinum:

    - contains at least 950 ppt of pure platinum may be marked or described as "Platinum"

    - contains 850, 900 or 950 ppt of pure platinum may be marked "Plat" or "Pt" if a number is used in front of the term to disclose the amount of pure platinum in the mix, such as "850 Plat" or "850 Pt" etc

    - contains at least 950 ppt of platinum group metals, with at least 500 ppt of the total pure platinum, may be marked as platinum as long as the numbers of each metal are disclosed. Eg,

    "550Pt. 350Pd. 50Ir." or "550Plat. 350Pall. 50Irid." for 550 parts pure platinum, 350 parts palladium and 50 parts iridium

    The FTC is currently considering a request to allow manufacturers to mark jewelry as platinum even if it contains metals that are not part of PGM.

    The Platinum Group of Metals (PGM)

    Six related metals belong to PGM:

    1. Platinum

    2. Iridium

    3. Palladium

    4. Ruthenium

    5. Rhodium

    6. Osmium

    I hope this can help your understanding. :)

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