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https://www.leaf.tv/articles/what-does-pt-stand-for-on-a-gold-chain/
If the jewelry is marked "PL," "PLAT" or "PT," the piece is made of platinum. The symbol for platinum on the periodical table is "Pt." Platinum Alloy. Platinum is a soft metal and, therefore, high-quality jewelry contains a combination of 95 percent platinum and 5 …
https://www.streetdirectory.com/travel_guide/35041/jewelry/what_do_carats_and_points_mean_pertaining_to_diamonds.html
It is a common mistake to think that the carat weight of a diamond is its size. Actually, carat weight is how much a diamond weighs, and while there is an increase in size for an increase in weight, the carat measure does not quantify a stone's size.
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Jewelry that contains at least 950 parts per thousand of pure platinum may be marked or described as "Platinum". Jewelry that contains 850, 900 or 950 parts per thousand 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", or
http://www.justjewellery.com.au/Abbreviations.aspx
PT = Peridot S = Sapphire SLG = Sapphire Low Grade SS = Synthetic Sapphire. Size 17 = 1.7mm 20 = 2.0mm 25 = 2.5mm 30 = 3.0mm 35 = 3.5mm 40 = 4.0mm 50 = 5.0mm 60 = 6.0mm 42 = 4x2mm 43 = 4x3mm 54 = 5x4mm 64 = 6x4mm 75 = 7x5mm 97 = 9x7mm
https://quickjewelryrepairs.com/articles/jewelry-stamps-what-do-they-really-mean/
Apr 20, 2016 · 900, 900PT, or PT 900 all signify that the metal used is 900 parts per 1,000 pure platinum, while 950, 950PT, and PT950 denote 950 parts per 1,000 are pure platinum. 925 – a piece with this stamp is made of sterling silver.Author: Chris Awad
https://www.quora.com/What-are-all-the-abreviations-and-meanings-that-are-stamped-on-jewelry
In the United States you would find the fineness mark (either some number of K for gold or a 3 digit number for gold, silver, and platinum - Sometimes the alloy mix for platinum; 90Pt10Ir or 95Pt5Ru) and the manufacturer’s hallmark. Sometimes if the manufacturer is small enough the designer also puts his hallmark/initials on the item. 27K views
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