În întreaga familie de diamante, diamantele negre adevărate sunt, de asemenea, foarte rare. Diamantele cu o cantitate mare de incluziuni negre sunt, în general, considerate diamante de calitate scăzută și pot fi utilizate numai în scopuri industriale. De Griscono Spirit Diamond este un diamant negru rar la nivel de bijuterie din lume, and it is also the largest cut black diamond [...]
Arhivele de categorii: Știri despre bijuterii
Amsterdam Diamond (Amsterdam Diamond), produs în Africa de Sud, este, de asemenea, un celebru diamant negru. Diamantul brut cântărește 55,85 ct, este negru închis și opac, deci este la fel și sub lumină puternică, dar acest diamant are un luciu foarte puternic. Diamantul a fost tăiat și lustruit de Amsterdam Drucker & Fiii. Din octombrie 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, în timp ce [...]
În 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. În secolul al XV-lea, it has become the center of diamond cutting and trading. In the 20th century, it became the center of cutting and grinding large diamonds. Astăzi, 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, [...]
Gemologia în zilele noastre își are originea în secolul al XVIII-lea d.Hr. Înainte de asta, oamenii din cele mai vechi timpuri știau să se decoreze cu oase de animale, scoici, pene, pietre frumoase și alte obiecte. Odată cu dezvoltarea istoriei, diferite culturi de bijuterii s-au dezvoltat treptat. Ceea ce poate fi numit o bijuterie? Pur și simplu pus, 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. De exemplu, 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; şi [...]