(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 […]
คลังเก็บหมวดหมู่: ข่าวเครื่องประดับ
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, while […]
ใน 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. In the 15th century, it has become the center of diamond cutting and trading. In the 20th century, it became the center of cutting and grinding large diamonds. วันนี้, 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, shells, feathers, beautiful stones and other objects. With the development of history, different jewelry cultures have gradually developed. What can be called a gem? เพียงแค่ใส่, 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. ตัวอย่างเช่น, 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; และ […]
Most of the transparent gems belong to the mineral group, while the transparent to opaque gems are mostly rock types. Organic gems are gems formed from animal bones, secretions or plant fossils. 1. mineral Mineral gems are formed in the earth’s crust and have a fixed chemical composition and crystal form, and most of them […]
The evolution of jewelry is represented by several well-known periods, each with its own unique style, derived from the influence of art and culture at that time. The jewelry of each period seems to be a microcosm of the culture at that time and has different meanings in different eras. ancient times Starting from the […]