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 […]
Arquivos de categoria: Notícias de jóias
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, […]
Gemology nowadays originated in the eighteenth century AD. Before that, humans in ancient times had known to decorate themselves with animal bones, conchas, penas, beautiful stones and other objects. With the development of history, different jewelry cultures have gradually developed. What can be called a gem? Simplificando, all kinds of materials that can be […]
As condições geológicas de formação de gemas são diferentes, e a área de distribuição das gemas depende principalmente das propriedades do maciço rochoso formado pelas gemas. Por exemplo, diamantes são formados em Kimberlito, mas nem todos os Kimberlites produzem diamantes. Ainda depende se a área tem condições suficientes para o cultivo de diamantes; e […]