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 […]
カテゴリアーカイブ: ジュエリーニュース
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) カリナンNo.. 3: 洋ナシの形をしており、重さは94.40カラットです。. メアリー女王の王冠のてっぺんにはめ込まれていました. (4) カリナン IV: 長い角のはしごの形をしており、重さは63.70カラットです。. メアリー女王の王冠の円形の縁にはめ込まれていました. カリナン. 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, その間 […]
で 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 […]
Antwerp has dominated the gem trading in Europe since the Middle Ages. 15世紀には, it has become the center of diamond cutting and trading. In the 20th century, it became the center of cutting and grinding large diamonds. 今日, 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, シェル, 羽, beautiful stones and other objects. With the development of history, different jewelry cultures have gradually developed. What can be called a gem? 簡単に言えば, all kinds of materials that can be […]
宝石形成の地質条件は異なります, 宝石の分布地域は主に宝石によって形成された岩石の性質に依存します. 例えば, ダイヤモンドはキンバーライトで形成されます, しかし、すべてのキンバーライトがダイヤモンドを産出するわけではありません. その地域にダイヤモンドが成長するのに十分な条件があるかどうかに依ります。; そして […]