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https://www.leaf.tv/articles/what-does-pt-stand-for-on-a-gold-chain/
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 percent of a metal alloy, such as ruthenium or iridium, to give it strength.
https://www.liveabout.com/platinum-jewelry-information-2043747
Aug 17, 2017 · Platinum is a rare precious metal primarily used to create fine jewelry. Its heavy weight and durability make platinum a metal that will not wear away with constant use like gold. Platinum holds fine gemstones firmly in place for the life of the jewelry when used for …
https://www.reference.com/world-view/pt950-mean-stamped-ring-bad571d0248af8fa
Aug 04, 2015 · The stamp PT is an abbreviation for platinum, and PT950 refers to the number of parts per thousand that are pure platinum. Platinum alloys are about 90 percent to 95 percent pure; therefore, a higher percentage of an item's weight is made up of the metal.
https://www.collectorsweekly.com/stories/100601-bracelet-marked-925-pt
The pt is most likely the maker, manufacturer, or place. These 2-3 letter markings on "Italy" "china" "Thailand" are nearly impossible to actually ID. Shirgirl , 7 years ago
https://www.streetdirectory.com/travel_guide/35041/jewelry/what_do_carats_and_points_mean_pertaining_to_diamonds.html
Another thing that can affect the value of a stone is how it is cut. Gem-cutters can choose to emphasize certain qualities, but doing so can affect others. And just because two stones have the same carat rating does not mean that they will be cut in the same way.
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://www.jewelrynotes.com/measure-diamond-weight-carats-points/
Carats and points are units of mass commonly used to measure the weight of diamonds and other gemstones. One carat is equal to 200 milligrams, or 0.2 grams. One point is equal to 1/100th of a carat. So, it follows that one point equals 2 milligrams, or 0.002 grams.
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