Diamond Glossary T...

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A to Z of Diamonds Glossary

Diamonds Index

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.

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Table Cut A simple, obsolete cut with one "slice" cleaved or polished from (usually) an octahedral. forming a table as on a modern stone.
Table Facet The top and largest facet on most diamonds including brilliant cuts.
Tacy Tacy Ltd. Diamond Industry Consultants is a specialist strategic consultancy house and ‘think-tank’ exclusively serving the stakeholders in the international diamond industry. Publishers of Diamond Intelligence Briefs.
Tang A tool or arm for holding a diamond while it is being ground or polished against a scaife.
Tension Setting A method of setting diamonds and other gems using only the springiness of the mount to hold the stone firm. Can look quite spectacular but rather chunky and heavy; insecure otherwise. Best avoided in our opinion, or use small unobtrusive underbezel to achieve similar effect.
Termite, Termites Prospectors have used termites, or their mounds to help detect diamonds. Termites burrow down to retrieve water, and carry back with them indicator minerals. Termite or Adam Ant?
Tetrahedron Having four faces. Tetrahedral is one of the crystal forms of diamond.
Thermoluminescence The property of diamonds and other materials to emit light when heated.
Thickness Usually describing a girdle, and often expressed as a percentage of the height or depth of the diamond, often using relative terms such as "medium".
Tiffany The name of a famous diamond, also a famous jeweller. Commonly used, presumably in breach of trade mark, for a particular style of diamond claw (prong) setting.
Tolkowsky Usually referring to Marcel Tolkowsky who published his book "Diamond Design" in 1919, helping to revolutionise diamond cutting. Gaby (Gabi) Tolkowsky is also a famous diamond cutter.
Tone An aspect of colour, important in grading fancy coloured diamonds.
Top The part of the diamond above the pavilion, correctly called the "crown". Also a modifier used in descriptive colour grading systems, meaning better than or in the upper range of , e.g. top silver cape.
Top Light Brown A relatively lightly coloured brownish diamond, often bordering on white.
Top Silver Cape A diamond colour grade in obsolescent descriptive system, between commercial white and silver cape.
Top Wesselton A diamond colour grade in obsolescent mainly Scandinavian system, referring to a diamond of a colour at the top end of what could be expected from the Wesselton Mine.
Total Crap Famous words of Gerald Ratner, for which he will never be forgotten.
Total Internal Reflection An optical effect when light travelling in a higher refractive index material hits a boundary with a lower refractive index, and is reflected totally. Important when calculating diamond cutting angles.
Trading Company Usually referring to the "Diamond Trading Company", or DTC, part of De Beers.
Translate, Translation Translation of the word diamond into a number of other languages.
Transparent, Transparency Ideally, a diamond should be completely transparent, any opacity is undesirable.
Trap Cut Also known as step cut. A traditional way to cut rectangular, octagonal or other non-round diamonds, including emerald cuts. Looses brilliance compared with more modern brilliant cut styles.
Treated, Treatment Ignoring the fact that cutting and polishing of rough diamonds is a form of treatment, this usually refers to diamonds which have been processed in some way to enhance their colour or clarity.
Triangle, Triangular, Trilliant, Trillion A diamond which is three sided viewed from above. May be step cut or modified brilliant cut.
Trigon, Trigons Triangular marks, usually small, and quite common on surfaces of rough and polished diamonds, due to twinning and other crystal growth factors.
Twin, Twinned, Twinning Twinning occurs when two or more crystals have formed together, where a single crystal has had a change in its crystal growth directions, or when negative crystal growth has taken place.
Type, Types There are two main "types" of diamond, type 1 containing nitrogen, and type 2 without significant nitrogen. Each type has two sub-types, A and B.

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!

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Table Cut	A simple, obsolete cut with one "slice" cleaved or polished from (usually) an octahedral. forming a table as on a modern stone.
Table Facet	The top and largest facet on most diamonds including brilliant cuts.
Tacy	Tacy Ltd. Diamond Industry Consultants is a specialist strategic consultancy house and ‘think-tank’ exclusively serving the stakeholders in the international diamond industry. Publishers of Diamond Intelligence Briefs.
Tang	A tool or arm for holding a diamond while it is being ground or polished against a scaife.
Tension Setting	A method of setting diamonds and other gems using only the springiness of the mount to hold the stone firm. Can look quite spectacular but rather chunky and heavy; insecure otherwise. Best avoided in our opinion, or use small unobtrusive underbezel to achieve similar effect.
Termite, Termites	Prospectors have used termites, or their mounds to help detect diamonds. Termites burrow down to retrieve water, and carry back with them indicator minerals. Termite or Adam Ant?
Tetrahedron	Having four faces. Tetrahedral is one of the crystal forms of diamond.
Thermoluminescence	The property of diamonds and other materials to emit light when heated.
Thickness	Usually describing a girdle, and often expressed as a percentage of the height or depth of the diamond, often using relative terms such as "medium".
Tiffany	The name of a famous diamond, also a famous jeweller. Commonly used, presumably in breach of trade mark, for a particular style of diamond claw (prong) setting.
Tolkowsky	Usually referring to Marcel Tolkowsky who published his book "Diamond Design" in 1919, helping to revolutionise diamond cutting. Gaby (Gabi) Tolkowsky is also a famous diamond cutter.
Tone	An aspect of colour, important in grading fancy coloured diamonds.
Top	The part of the diamond above the pavilion, correctly called the "crown". Also a modifier used in descriptive colour grading systems, meaning better than or in the upper range of , e.g. top silver cape.
Top Light Brown	A relatively lightly coloured brownish diamond, often bordering on white.
Top Silver Cape	A diamond colour grade in obsolescent descriptive system, between commercial white and silver cape.
Top Wesselton	A diamond colour grade in obsolescent mainly Scandinavian system, referring to a diamond of a colour at the top end of what could be expected from the Wesselton Mine.
Total Crap	Famous words of Gerald Ratner, for which he will never be forgotten.
Total Internal Reflection	An optical effect when light travelling in a higher refractive index material hits a boundary with a lower refractive index, and is reflected totally. Important when calculating diamond cutting angles.
Trading Company	Usually referring to the "Diamond Trading Company", or DTC, part of De Beers.
Translate, Translation	Translation of the word diamond into a number of other languages.
Transparent, Transparency	Ideally, a diamond should be completely transparent, any opacity is undesirable.
Trap Cut	Also known as step cut. A traditional way to cut rectangular, octagonal or other non-round diamonds, including emerald cuts. Looses brilliance compared with more modern brilliant cut styles.
Treated, Treatment	Ignoring the fact that cutting and polishing of rough diamonds is a form of treatment, this usually refers to diamonds which have been processed in some way to enhance their colour or clarity.
Triangle, Triangular, Trilliant, Trillion	A diamond which is three sided viewed from above. May be step cut or modified brilliant cut.
Trigon, Trigons	Triangular marks, usually small, and quite common on surfaces of rough and polished diamonds, due to twinning and other crystal growth factors.
Twin, Twinned, Twinning	Twinning occurs when two or more crystals have formed together, where a single crystal has had a change in its crystal growth directions, or when negative crystal growth has taken place.
Type, Types	There are two main "types" of diamond, type 1 containing nitrogen, and type 2 without significant nitrogen. Each type has two sub-types, A and B.