On silver, a 'P' mark often indicates Electroplated Nickel Silver (EPNS) for silver-plated items, meaning a base metal coated in silver, or it could be a Polish hallmark from Poznan for sterling silver. It can also signify "Plumb" for gold purity (like 10KP), but in silver context, especially with "EP," it points to plating or regional origin.
P: A “P” mark indicates the piece is plumb, meaning the gold purity is exact. Example: '10KP' is exactly 41.7% gold.
What do markings on silver mean? Today, the compulsory minimum hallmark requirement is to show the sponsor or maker mark, fineness, and assay office. The sponsor's mark is either the maker, the importer, or the seller. The markings on silver therefore mean who made it, how pure is it, and who has tested it.
"Silver codes" refer to quality markings on silver items (like 925 for sterling, 900 for coin silver, 800 for European silver), ISO currency codes (like XAG for silver metal, XAG for precious metals, XAG ISO 4217), color codes (like #C0C0C0 in hex), or sometimes game redemption codes, but most commonly relate to silver purity stamps. These codes help identify metal content, authenticity, and value.
There are 5 standard marks found on British Silver:
The date letter hallmark on silver is a key indicator of the year the piece was officially hallmarked. You can find a complete list of date letters here . To illustrate, we've provided an example below featuring the date letter for Birmingham in 1774.
999 Silver. Fine silver is the closest metal to the pure element silver. It is marked . 999 which indicates 99.9% purity.
Hallmarks that say "plate," "electro-plate," "EPNS," or anything other than "925," sterling," or "800," are not actually silver. Anything that is " German silver " is also not silver at all, but an alloy of nickel and copper.
You might have seen "925" stamped on rings, chains, or earrings—that's your mark of quality. If you're buying wearable silver, this is usually the best option. Also known as Britannia silver, this grade contains 95.8% pure silver, with the remainder typically being copper.
The hex code for metallic silver is #999B9B. Similar hex codes include #B0C4DE (light blue steel) and #8A92A6 (cool gray).
Silver hallmarks comprise four main elements to tell you this: the town mark, the date letter, the maker's mark, and the lion passant. During the period between 1784-1890 a duty was placed on gold and silver, leading to the introduction of the duty mark.
Silver is a chemical element with symbol Ag and atomic number 47. Classified as a transition metal, Silver is a solid at 25°C (room temperature).
Purity Marks
The “925” stamp, widely used in the USA, is the most familiar, signifying the piece is 92.5% silver with alloys added for strength and durability. In Germany, you might see “800” on older pieces, while French silver often bears a Minerva head, a nod to its high standards.
The research I did on the metal was that the P indicated 3% Platinum in the Sterling Silver alloy/ mix.
A karat marking followed by 'P' indicates that the piece is plumb, meaning the purity is exact. For example, '10KP' is exactly 41.7% gold. Federal law allows the stamp to deviate . 5 karats from the exact purity, so a '10K' stamp could be as low as 9.5 karats, but the plumb stamp guarantees the exact 41.7%.
A parure, which literally means 'set' in French, is the formal name given to a suite of jewelry, usually a combination of a matching necklace, earrings, brooch and bracelet (although a diadem and other accessories can also be included).
One reliable method is to look for hallmarks or jewelry stamps on the piece, which typically indicate purity levels, such as “925” for sterling silver. Another method is the magnet test; genuine silver is not magnetic, so if a magnet sticks to the item, it's likely not real silver.
The silver HEX code picker is #C0C0C0. This is the medium-light gray inspired by the polished metallic hue of the precious metal. The color silver can be achieved in a RGB space with 192 red, 192 green, and 192 blue. Silver color can be achieved in a CMYK color space with 0% cyan, 0% magenta, 0% yellow, and 25% black.
Look For Hallmarks And Mintmarks
These marks act like tags telling you who made the piece, what it was made from, and sometimes even when it was made. Most often you will see a maker's mark which is almost like a signature of the maker, and a quality mark that indicates the amount of silver in the piece.
To test silver with vinegar, mix equal parts of white vinegar and baking soda in a bowl and stir until the baking soda is dissolved. Then, dip a clean cloth or cotton swab into the mixture and apply it to the silver object. If the object is real silver, the mixture will cause a reaction that will bubble and fizz.
Genuine sterling silver pieces often bear specific markings or 'hallmarks' that serve as evidence of their authenticity: in particular, look for a stamp marked as '925', 'Ster', 'Sterling', or 'Sterling Silver'. The '925' hallmark is particularly significant, referring to the 92.5% pure silver content in the piece.
Different Types of Silver
The 80/50 rule for silver is a precious metals investing strategy using the gold-to-silver ratio: switch into silver when the ratio (ounces of silver per ounce of gold) goes above 80 (silver is cheap), and switch back to gold when it drops below 50 (silver is expensive), aiming to profit from the ratio's mean reversion by rotating between undervalued metals. This strategy signals a good time to buy silver when gold is relatively expensive compared to silver, and a good time to buy gold when silver has become disproportionately expensive.
The grade shows how much silver is in a piece compared to other metals. Silver is usually measured in parts per thousand. For example, if a silver piece is 925, it means that 925 parts out of 1,000 are pure silver. The higher the number, the purer the silver.