Zaire | The name of the Democratic Republic of the Congo from 1965 to 1997. Produces a large proportion of the world production of industrial diamonds.
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Zinnia Cut | One of a number of "flower cuts" developed by Gaby Tolkowsky in about 1997 for De Beers.
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Zircon | Rare, natural blue gemstone. Do not confuse it with Cubic Zirconia.
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Zirconia | Usually referring to Cubic Zirconia.
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ZrO2 | Zirconium Oxide, or more accurately Zirconium Dioxide, also called zirconia, when crystallised in cubic system, it is known as Cubic Zirconia, the most successful imitation diamond.
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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!