Cristal Esmeralda Guinness, pesando 1759 ct, é produzido na área de mineração de Coscuez, na Colômbia. É também um dos maiores cristais de esmeralda de alta qualidade encontrados no mundo. Ela criou a maior esmeralda verde de alta qualidade do mundo, Guinness World Records. O comprimento do cristal é 2-2.5 vezes o diâmetro, the color is bright […]
Arquivos de autores: Kingjy
Opala também é uma pedra preciosa com uma longa história e é chamada de opala preciosa em mineralogia.. De 200-100 AC, as pessoas começaram a usar opalas como gemas. Na Roma antiga, opalas não eram apenas conhecidas, mas também extremamente valioso. Plínio, o antigo naturalista romano, uma vez deu uma descrição maravilhosa de Opala: “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, enquanto […]
Em 1970, Tel Aviv já era um dos principais centros de corte de diamantes do mundo. De seu foco inicial em cortar pequenos diamantes, Israel se transformou em um grande cortador de diamantes grandes e sofisticados nos anos 80. The diamond processing factory in Israel is known as the model of the highest level of diamond technology […]
Antwerp has dominated the gem trading in Europe since the Middle Ages. No século 15, it has become the center of diamond cutting and trading. In the 20th century, it became the center of cutting and grinding large diamonds. Hoje, it has undoubtedly become the world’s most rough and cut diamonds. Trading hub for […]
The object of color grading is Cape series diamonds, which are graded from colorless to light yellow according to color density. Colorless to light yellow with continuous color changes are artificially defined as a series of boundaries. These boundaries are also color levels, which represent a certain color density range. The higher the color level, […]