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Round Brilliant Cut Diamond

A to Z of Diamonds Glossary
Alphabetical list of main words and terms relating to diamond or diamonds, containing over 600 entries, with definitions, explanations and links to more detailed information.

BaguetteA rectangular or oblong step or trap cut used for diamonds and other gemstones.
BalanceA diamond balance is any scale or balance specially designed for weighing diamonds, and is calibrated in carats, often with a resolution of 1/1000 of a carat.
BananaA colour description used for certain fancy brownish yellow diamonds.
Banque Diamantaire ( Suisse ) S.A.The French name of The Diamond Bank (Switzerland) Ltd.
BarionAn early forerunner of the princess cut, an improved facetting arrangement for baguette or square diamonds introduced in 1971 by Basil Watermeyer and his wife Marion.
BaroqueAny irregularly shaped diamond. Also any jewellery from the Baroque period of the 17th and 18th centuries or in similar style.
BeadDiamonds are sometimes drilled for threading as beads.
Bearded, BeardingSmall stress cracks around the girdle caused by bruting (rounding) too quickly or with too much force.
Best DiamondsA typical diamond FAQ is "where do the best diamonds come from". There is no single quick answer, apart from the slightly facetious "in the ground". We are in process of preparing a more complete answer which will be linked from here when ready.
Best Practice PrinciplesAn "Assurance Programme" to be rolled out across the entire De Beers group, as well as to Sightholders and their business partners "to enhance and uphold the fine values diamonds represent".
BetrothalA slightly old fashioned word for engagement (to marry). A mutual promise to marry. In earlier times this was considered fully or partially binding. Mary of Burgundy is often cited as the first woman to receive a diamond betrothal or engagement ring.
BezelGenerally as rim or sloping side. The bezel facets of a diamond are also known as kite facets.
BHP BillitonThe second most active diamond prospecting company after De Beers. Owns the Ekati mine in Canada, producing 4% and 6% of world's diamonds by volume and value respectively. Markets using CanadaMark brand name.
Big, BiggestThe biggest diamond known is a star 'Lucy' discovered in February 2004 by Harvard-Smithsonian Center for Astrophysics. Biggest on earth are listed on Large & Famous Diamonds.
Black OrlovThe Orlov (or Orloff) Black) is a large famous diamond. Although not the largest black diamond, it is probably the most famous because of a supposed curse. It was originally called the Eye of Brahma, but was recut into three smaller stones.
Black Star of AfricaAt over 200 carats, this is about the 11th largest diamond in the world.
BlackProbably the least attractive colour for diamond, although there seems good demand for treated black diamonds. The main attraction surely being the excellent surface lustre. Black is technically the complete absence of any colour. Many black diamonds have poor surface quality and are probably partially carbonado.
Black Diamond"Black diamond" is a term used in American ski resorts to designate a steep slope or one which involves challenging terrain. So called because the marker signs show a black diamond (lozenge) shape on a white background.
BlackpoolThe location of the Chard office and showroom.
BlueA very rare and valuable colour for diamonds. All natural blue diamonds are type 2b, and contain traces of boron.
BlemishAn external mark or imperfection on a diamond, implicitly only slight and capable of being removed.
Blocker, BlockingDiamond cutter who grinds or cuts the first 18 facets being table, culet, and first eight facets on the crown and pavilion. A brillianteer polished the final 40 facets.
Blood DiamondAnother name for Conflict Diamond. Also the name of a 2006 film set in Sierra Leone in 1999.
Blue BookThe CIBJO Blue Book is a definitive set of standards for the grading, methodology and nomenclature standards for diamonds, coloured gemstones and pearls, in which the latter incorporates all organic materials.
Blue Ground, BluegroundUnweathered kimberlite rock, normally diamondiferous, and named after Kimberley in South Africa.
Blue White, Blue-WhiteOriginally describing near white diamonds with strong blue fluorescence, often misleadingly used or abused term to confer the idea of whiter than white.
BoartFrom Dutch boort, imperfectly crystallized diamond or diamond fragments used as an abrasive. Round, or shot, bort, found at Kimberley, was valuable for diamond drill points. Also spelt bort.
Body ColourThe colour of light seen through a diamond without any dispersion, usually viewed through the side of a stone. A diamond's actual colour.
BortFrom Dutch boort, imperfectly crystallized diamond or diamond fragments used as an abrasive. Round, or shot, bort, found at Kimberley, was valuable for diamond drill points. Also spelt boart.
BotswanaThe most important source of rough diamonds by value if not in volume.
BourseOne of about 25 associations or clubs with premises for dealers in rough or polished diamonds. A member of the World Federation of Diamond Bourses.
Beurs voor DiamanthandelAntwerp Diamond Bourse. A meeting place for dealers to trade, mainly polished diamonds.
Bow Tie, BowtieAn optical effect adversely affecting marquise and other fancy cuts of diamonds, can be minimised by careful cutting using best proportions and angles.
Brabant RoseA hexagonal rose cut with 12 upper facets, and a flat base facet, also called Antwerp rose.
Bracelet, BraceletsA piece of jewellery usually worn around the wrist, often containing diamonds.
BrazilDiamonds were discovered in Brazil in 1725, when it became the main source of diamonds. By the 19th century, most of its diamond deposits were depleted, and few diamonds are mined today.
BriefjesA packet or paper specially produced for containing diamond parcels. They usually contain several inner leaves of crinkly bluish paper, designed to make the diamonds look whiter. Learning to fold and refold them is an acquired skill.
BrillianceThe brightness and sparkle of a diamond, not to be confused with its fire or dispersion.
Brilliant CutA diamond cut using modern facetting layouts, as described by Tolkowsky and others, with 58 facets. Normally round, but there are modified variants in other shapes.
Brillianteer, BrillianteeringPerson who grinds or polishes the fourty final facets on a brilliant cut diamond after the "blocker" has cut the table and the "eights" on the crown and pavilion.
BrioletteA long teardrop shaped diamond with rose cut facets, sometimes drilled, used as a pendant.
Broche, Mazel &Jewish phrase often said at the conclusion of a diamond trade by the seller to the buyer, meaning good luck and god be with you.
BrokerA specialist who introduces diamond buyers and sellers, earning his commission on the value of deals done.
Brooch, BroochesJewellery worn on the lapel or chest, sometimes containing diamonds.
BrownAttractive or vivid brown diamonds are rare, and classed as fancy coloured, slightly brownish stones (off-white) are slightly less common than slightly yellow, and offer reasonably priced alternatives to colourless stones.
BruiseAn inclusion consisting of surface crumbling, often accompanied by tiny, root like feathers, usually caused by external trauma such as a knock.
BrutingThe process of rounding a diamond to form its girdle, customarily done by grinding one diamond against another on a rotating wheel. Some American retailers call this girdling. It may also be called rounding.
Burn, Burnt, BurnedA facet may appear foggy, whitish, or burnt, as a result of the cutter polishing the facet against the grain, or otherwise allowing the diamond to overheat causing the surface to oxydise.
Buying Office, Buying OfficesOffices set up, usually in or close to diamond mining areas by individuals or companies including De Beers, to purchase rough diamonds from miners.

There are currently over 600 entries in this table.
Over 90 of them have page links to a page on this site. Eventually, we intend to add a more complete description for most entries, each on its own page. Please watch this space! the Lowest Possible Price

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