Synthetic and artificial gemstones

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Some gemstones are manufactured to imitate other gemstones. For example, cubic zirconia is a synthetic diamond simulant composed of zirconium oxide. The imitations copy the look and color of the real stone but possess neither their chemical nor physical characteristics. However, true synthetic gemstones are not necessarily imitation. For example, diamonds, ruby, sapphires and emeralds have been manufactured in labs, which possess very nearly identical chemical and physical characteristics to the genuine article. Synthetic corundum's, including ruby and sapphire, are very common and they cost only a fraction of the natural stones. Smaller synthetic diamonds have been manufactured in large quantities as industrial abrasives for many years. Only recently, larger synthetic diamonds of gemstone quality, especially of the colored variety, have been manufactured.

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Fictional gemstones

Much like their real-life counterparts, fictional gemstones are things of beauty, admiration, or curses.
Bhelliom: The Elenium and The Tamuli by David Eddings - a sapphire jewel of unlimited power
Castafiore Emerald, The: The Castafiore Emerald - the eponymous stone from a Tintin adventure
Chaos Emeralds: Sonic The Hedgehog
El Corazon:Romancing the Stone - Also known as The Heart
Heart of Ahriman: Hour of the Dragon by Robert E. Howard
Heart of Kandrakar - W.I.T.C.H.
Heart of the Ocean: Titanic - a large triangular blue diamond
Jewel of the Dragon's Neck: Inuyasha

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Jewel of Four Souls: Inuyasha - also known as The Shikon Jewel.
The Pink Panther - a large and valuable diamond from the first film in the Pink Panther series
Silmarils, The: The Silmarillion
The Spiritual Stones: The Legend of Zelda: Ocarina of Time
Tear of Offler: Discworld - the largest diamond on the Disc. Regularly stolen from the Lost Temple by adventurers.
The Tears of All Oceans: six perfect pink pearls from The Pearls of Lutra by Brian Jacques
Wayne Diamonds, The: Batman & Robin - large diamonds used to lure out Mr. Freeze

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