Jade | A description of the colour of certain green diamonds.
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Japan | Diamond engagement rings were unknown in Japan as late as the 1960's. De Beers has successfully targeted this market starting in 1967, and almost all Japanese brides now receive, or expect to receive, a diamond engagement ring.
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Jeffries, David | A 1750's pioneer in the study and practice of diamond cutting.
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Jewel, Jewelry, Jewellery | Diamonds are not necessarily jewellery, and vice versa, but diamond jewellery accounts for the bulk of diamond demand and sales by value, and is an important section of the jewellery market.
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Jeweller | One who works with jewellery. Many retail jewellers are merely shopkeepers.
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Jubilee | A shape of diamond cut with 8- facets. A large (245 carats) and famous diamond, originally called the Reitz diamond. Renamed when it was recut in 1897 during Queen Victoria's diamond jubilee year.
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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!