Diamant d'Amsterdam (Diamant d'Amsterdam), produit en Afrique du Sud, est aussi un célèbre diamant noir. Le diamant brut pèse 55,85 ct, est noir foncé et opaque, donc c'est aussi la même chose sous une forte lumière, mais ce diamant a un éclat très fort. Le diamant a été taillé et poli par Amsterdam Drucker & Fils. À partir d'octobre 1972 [...]
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(3) Cullinan No. 3: It is pear-shaped and weighs 94.40ct. It was inlaid on the top of Queen Mary's crown. (4) Cullinan IV: It is in the shape of a long-angled ladder and weighs 63.70ct. It was inlaid on the circular edge of Queen Mary's crown. The Cullinan No. 3 diamond is now set as [...]
The naked eye identification of rough diamonds should start from the following aspects. (1) Observe the gloss Since diamonds have a typical diamond luster, which is an important feature that distinguishes other colorless and transparent minerals (or materials), diamonds can be distinguished from other imitations by using their luster characteristics. When observing the gloss of [...]
The unique properties of diamond make it leave some cutting characteristics during processing, these characteristics are not possessed by diamond imitations, so it is possible to identify diamonds and imitations. 1. Facets, edges and corners The high hardness of the diamond determines that the diamond has a flat surface, straight edges, and sharp corners, alors que [...]
Dans 1970, Tel Aviv was already one of the world's major diamond cutting centers. From its initial focus on cutting small diamonds, Israel has transformed into a major cutter of large and fancy diamonds in the 1980s. The diamond processing factory in Israel is known as the model of the highest level of diamond technology [...]
Anvers a dominé le commerce des gemmes en Europe depuis le Moyen Âge. Au XVe siècle, Il est devenu le centre de la coupe et du trading de diamants. Au 20e siècle, Il est devenu le centre de la coupe et du broyage de grands diamants. Aujourd'hui, it has undoubtedly become the world's most rough and cut diamonds. Trading hub for [...]
L'objet du classement des couleurs est les diamants de la série Cape, qui sont classés de colocolage au jaune clair en fonction de la densité des couleurs. Le jaune incolore à clair avec des changements de couleur continue est défini artificiellement comme une série de limites. Ces limites sont également des niveaux de couleur, qui représentent une certaine gamme de densité de couleurs. Plus le niveau de couleur est élevé, [...]
Gemology nowadays originated in the eighteenth century AD. Avant cela, humans in ancient times had known to decorate themselves with animal bones, coquille, plumes, beautiful stones and other objects. With the development of history, different jewelry cultures have gradually developed. What can be called a gem? Mettre simplement, all kinds of materials that can be [...]
The geological conditions of gem formation are different, and the distribution area of gems mainly depends on the properties of the rock mass formed by the gems. Par exemple, diamonds are formed in Kimberlite, but not all Kimberlites produce diamonds. It still depends on whether the area has sufficient conditions for diamonds to grow; et [...]
La plupart des joyaux transparents appartiennent au groupe minéral, tandis que les joyaux transparents à opaques sont principalement des types de roches. Les joyaux organiques sont des joyaux formés à partir d'os d'animaux, sécrétions ou fossiles végétaux. 1. mineral Mineral gems are formed in the earth's crust and have a fixed chemical composition and crystal form, and most of them [...]