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What Is your Favourite Opal?

The Most Expensive Gemstones in the World Infographic - more on the site.

The Most Expensive Gemstones in the World Infographic - more on the site.

Diamante "Hortense" color rosa, di 20 carati, chiamato come Hortense de Beauharnais, figliastra di Napoleone, scomparso durante la Rivoluzione, riapparve e N. lo fece montare sull'elsa della spada. L'ultima donna ad indossarlo fu la regina Eugenia de Montijo, moglie di Napoleone III; molti gioielli della corona furono venduti, ma non questo e il Régent che vennero conservati e esposti al Louvre. Quasi un secolo dopo si unì un altro famoso diamante, il Sancy.

Diamante "Hortense" color rosa, di 20 carati, chiamato come Hortense de Beauharnais, figliastra di Napoleone, scomparso durante la Rivoluzione, riapparve e N. lo fece montare sull'elsa della spada. L'ultima donna ad indossarlo fu la regina Eugenia de Montijo, moglie di Napoleone III; molti gioielli della corona furono venduti, ma non questo e il Régent che vennero conservati e esposti al Louvre. Quasi un secolo dopo si unì un altro famoso diamante, il Sancy.

"GeoPicture of the week: Tree fossil with opal growth rings -- This is an very rare sample: opal can be fairly common in petrified wood, but this is a fire opal, which makes it so much more valuable. …So how did this magnificent opalized tree came to be? Initially, water filled the cracks and empty spaces of the source fossil, and the silica content in the water hardened and turned into opal or chalcedony."

"GeoPicture of the week: Tree fossil with opal growth rings -- This is an very rare sample: opal can be fairly common in petrified wood, but this is a fire opal, which makes it so much more valuable. …So how did this magnificent opalized tree came to be? Initially, water filled the cracks and empty spaces of the source fossil, and the silica content in the water hardened and turned into opal or chalcedony."

Cullinan diamond before being cut (replica). the largest rough gem-quality diamond ever found at 3106.75 carats (621.35 g). It was cut into 105 diamonds including the Cullinan I or the Great Star of Africa, 530.2 carats (106.04 g), and the Cullinan II or the Lesser Star of Africa, 317.4 carats (63.48 g), both of which are now part of the British Crown Jewels.

Cullinan diamond before being cut (replica). the largest rough gem-quality diamond ever found at 3106.75 carats (621.35 g). It was cut into 105 diamonds including the Cullinan I or the Great Star of Africa, 530.2 carats (106.04 g), and the Cullinan II or the Lesser Star of Africa, 317.4 carats (63.48 g), both of which are now part of the British Crown Jewels.

Sean Connery's 15.20 carat Orangy Pink Diamond sells for over $4 Million by Sotheby's

Sean Connery's Pink Diamonds are Forever

Sean Connery's 15.20 carat Orangy Pink Diamond sells for over $4 Million by Sotheby's

ammonite--The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns.

ammonite--The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns.

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