Bullion
Precious metals (such as gold, silver, or platinum) valued strictly by weight and purity rather than face value or numismatic rarity.
Welcome to our master reference index for coin collecting vocabulary. Whether you are identifying rare minting error variants, trying to decode historical catalog references, or auditing auction logs, this comprehensive index demystifies essential numismatic terms and definitions used by expert numismatists worldwide.
Precious metals (such as gold, silver, or platinum) valued strictly by weight and purity rather than face value or numismatic rarity.
A higher-quality circulation-standard coin struck at higher speed than a proof but showcasing full, undisturbed original mint bloom.
A sweeping, pinwheel-like light effect observed on uncirculated coins as light reflects off microscopic metal flow lines created during striking.
A durable base-metal alloy containing 75% copper and 25% nickel used for UK decimal silver-coloured coinage from 1947 onward.
A hardened steel tool engraved with an incuse negative image used to stamp design details onto a blank metal planchet.
An error occurring when obverse and reverse dies strike each other forcefully without a blank planchet fed between them, transferring outline ghosting.
An error occurring during die creation where the master hub leaves a doubled impression on the working die, causing doubled lettering or numbers.
A coin grade indicating very light wear limited strictly to the highest points of the design, with considerable original mint luster remaining.
The small section on a coin's reverse below the main design, frequently separated by a horizontal line and containing the date or mint mark.
Lettering or mottoes engraved around the outer rim of a coin (e.g., 'DECUS ET TUTAMEN' on British £1 and £5 coins).
A French term used by numismatists to denote an absolutely perfect, flawless coin displaying full original strike quality.
A coin showing considerable wear from circulation, though all legend letters and principal design elements remain legible.
The flat, unprinted background surface of a coin surrounding the raised relief portrait or central design.
The proportion of pure precious metal contained in a coin, expressed in parts per thousand (e.g., 999.9 fine gold).
The standardized physical assessment evaluating a coin's state of preservation, wear, surface marks, and eye appeal.
Historic coins produced manually prior to 1662 by placing a blank metal disk between two dies and striking the top die with a hammer.
The lowest-mintage British circulating 50p coin issued in 2009 (210,000 pieces), making it the most sought-after decimal change rarity.
The principal inscription or lettering running around the outer perimeter of a coin's field.
Coins manufactured using industrial machine presses driven by water, horse, steam, or electricity rather than manual hammering.
A rare mint error coin produced when dies intended for two different coin issues or denominations are mistakenly paired together.
A small letter or symbol struck onto a coin indicating the facility where it was produced (e.g., 'M' for Melbourne, 'S' for Sydney on Sovereigns).
The total official quantity of a specific coin issue authorized and struck by a government mint during a given production period.
Grooves or vertical ridges cut into a coin's edge to prevent clipping or shaving precious metals off circulating currency.
Special sterling silver 1d, 2d, 3d, and 4d coins traditionally distributed by the British Monarch on Maundy Thursday to deserving recipients.
The formal study and collection of currency, including coins, tokens, paper money, and related medals.
The front side of a coin, usually featuring the reigning monarch's head, portrait, or national emblem (commonly called 'heads').
A coin struck using specially prepared dies and polished planchets under high pressure to produce mirror-like fields and frosted design details.
The plain disc of metal prepared for striking between two dies to produce a finished coin.
The natural surface oxidation layer forming on silver, copper, or bronze coins over time, often creating desirable iridescence.
A trial or prototype coin produced by a mint to test proposed design modifications or metals, never approved for general circulation.
A specially minted coin struck on a planchet double or triple the standard thickness, traditionally produced for VIP presentation sets.
British circulating coins struck between 1920 and 1946 containing a 50% silver alloy content.
The back side of a coin, typically featuring the denomination, heraldic design, or commemorative artwork (commonly called 'tails').
The raised portion of a coin design projecting outward from the flat background field.
A flagship British gold coin introduced in 1817 containing 7.32 grams of fine gold (22-carat), widely traded both as bullion and a collector key piece.
An alloy containing 92.5% pure silver and 7.5% base metals, used for pre-1920 British circulating silver coinage.
A coin professionally authenticated, graded, and permanently sealed in an air-tight, tamper-evident plastic holder by third-party services like NGC or PCGS.
A coin in brand-new condition that has never passed into commerce, retaining all original mint luster without high-point wear.
A striking error where a coin leaves the mint missing its year date, famously illustrated by the 2008 British 20p mule coin.
A coin displaying light to moderate wear across high points, though all major design details, letters, and borders remain crisp and distinct.