Troy weight them Holland troy, Paris troy, etc. Their values varied from one another by up to several percentage points. Troy weights were first used in England in the 15th century, and were made official for gold and silver in 1527. The British Imperial system of weights and measures (also known as Imperial units) was established in 1824, prior to which the troy weight system was a subset of pre-Imperial English units. The troy ounce in use today is essentially the same as the British Imperial troy ounce (1824–1971), adopted as an official weight standard for United States coinage by Act of
Gold IRA Savings Plan (TSP), and 401(k)s. The four precious metals allowed to be held in an individual retirement account are gold, silver, platinum and palladium, provided they are in the form of IRS-approved coin or bar products. Since gold is the most commonly purchased of the four, the overarching term "gold IRA" is used most often as industry slang to mean a retirement account containing any combination of precious metals. Other terms such as, "precious metals IRA", "silver IRA", "platinum IRA", or "palladium IRA" are also frequently used. Investors often use precious metals as a long-term hedge against inflation, to diversify