Judging from the discovery process of emeralds in the world, it is not difficult to see that the main origin of emeralds is Colombia in South America, and many legendary emerald treasures also originated from Colombia. 1. Devon emeralds Devenshire Emerald (Devenshire Emerald), discovered in the Muzuo mining area in Colombia in the 19th century, [...]
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Guinness Emerald Crystal, weighing 1759ct, is produced in the Coscuez mining area in Colombia. It is also one of the largest high-quality emerald crystals found in the world. It has created the world's largest high-quality gem-level emerald Green Guinness World Records. The length of the crystal is 2-2.5 times the diameter, the color is bright [...]
Opal is also a gemstone with a long history and is called precious opal in mineralogy. Aus 200-100 Chr, people began to use opals as gems. Im antiken Rom, opals were not only well-known, but also extremely valuable. Plinius, the ancient Roman naturalist, once gave a very wonderful description of Opal: "Opal has a ruby-like [...]
In the entire diamond family, true black diamonds are also very rare. Diamonds with a large amount of black inclusions are generally considered low-quality diamonds and can only be used for industrial purposes. De Griscono Spirit Diamond is a rare gem-level black diamond in the world, and it is also the largest cut black diamond [...]
Amsterdam Diamond (Amsterdam Diamond), produced in South Africa, is also a famous black diamond. The rough diamond weighs 55.85ct, is dark black and opaque, so it is also the same under strong light, but this diamond has a very strong luster. The diamond was cut and polished by Amsterdam Drucker & Sons. From October 1972 [...]
(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, während [...]
In 1970, Tel Aviv war bereits eines der größten Diamantenschleifzentren der Welt. Von Anfang an lag der Schwerpunkt auf dem Schleifen kleiner Diamanten, Israel hat sich in den 1980er Jahren zu einem bedeutenden Schleifer für große und ausgefallene Diamanten entwickelt. Die Diamantverarbeitungsfabrik in Israel gilt als Modell der Diamantentechnologie auf höchstem Niveau [...]
Antwerp has dominated the gem trading in Europe since the Middle Ages. Im 15. Jahrhundert, it has become the center of diamond cutting and trading. In the 20th century, it became the center of cutting and grinding large diamonds. Heute, it has undoubtedly become the world's most rough and cut diamonds. Trading hub for [...]