摘要:
The invention provides a method of changing a grey type IIb diamond from grey to blue or enhancing the colour of a type IIb diamond. Selected conditions of high temperature and high pressure are used to produce the colour change.
摘要:
The present invention is directed to a method for treating discolored natural diamond, especially Type IIa diamond and Type IaA/B diamond with nitrogen as predominantly B centers, for improving its color. The method includes preblocking and preshaping a discolored natural diamond to prevent its breakage in a high pressure/high temperature (HP/HT) press, placing said discolored natural diamond in a pressure transmitting medium which is consolidated into a pill. Next, the pill is placed into a HP/HT press at elevated pressure and elevated temperature within the graphite-stable or diamond-stable range of the carbon phase diagram for a time sufficient to improve the color of said diamond. Finally, the diamond is recovered from said press. Colorless and fancy colored diamonds can be made by this method.
摘要:
A method is provided for changing the colour of a brown type IIa diamond from brown to pink. The method involves subjecting the diamond to selected conditions of elevated temperature and elevated pressure to produce the colour change.
摘要:
The invention provides a method of changing a grey type IIb diamond from grey to blue or enhancing the colour of a type IIb diamond. Selected conditions of high temperature and high pressure are used to produce the colour change.
摘要:
Die Erfindung gehört zum Bereich der Diamantenbearbeitung (Diamantenveredelung), die das Anfärben mit verschiedenen Farben betrifft. Die Erfindung kann in der Schmuckwarenindustrie Anwendung finden. Das Verfahren besteht darin, dass im Kristallgitter eines Naturdiamanten vom Typ la, der Verarmungstypen enthält, oder im Kristallgitter eines Naturdiamanten vom Typ la mit hohem Stickstoffgehalt, der mehr als 800 ppm Stickstoffbeimischung vom Verarmungstyp A oder B1 enthält, isolierte Stickstoffatome in der Substitutionsposition gebildet werden, und zwar vom Verarmungstyp C. Der den Verarmungstyp A enthaltende Naturdiamant vom Typ la wird in einem Hochdruckgerät bei einer Temperatur von mehr als 2150° C bei einem stabilisierten Druck von 6,0-7,0 Gpa ausgeglüht, dann wird er durch einen Elektronenstrom von 5x10 15 -5x10 18 cm -2 bei 2-4 MEV bestrahlt und dem Aushärten im Vakuum bei einer Temperatur von mindestens 1100° C unterzogen. Der Naturdiamant vom Typ la mit hohem Stickstoffgehalt, der mehr als 800 ppm Stickstoffbeimischung vom Verarmungstyp A oder B1 enthält, wird durch einen hochenergetischen Elektronenstrom mit einer Bestrahlungsdosis von mehr als 10 19 cm -2 bestrahlt und dem Aushärten im Vakuum bei einer Temperatur von mindestens 1100° C unterzogen. Es ergeben sich Diamanten mit einer Phantasierotfarbe, die für Brillanten mit festen NV-Färbungszentren bestimmt sind, die im Wellenlängenbereich von 400-640 nm absorbieren.
摘要:
The present invention is directed to a method for treating discoloured natural diamonds, especially Type laB diamond and Type laA/B diamonds with platelets for improving their color. The method includes placing a discoloured natural diamond in a pressure transmitting medium (40) which is consolidated into a pill. Next, the pill is placed into a high pressure/high temperature (HP/HT) press (10) at elevated pressure and elevated temperature within the graphite stable or diamond stable range of the carbon phase diagram for a time sufficient to improve the color of said diamond. Finally, the diamond is recovered from said press (10). Attractive yellowish-green, greenish-yellow and neon yellow-green diamonds can be made by this method.
摘要:
The present invention is directed to a method for treating discoloured natural diamond, especially Type IIa diamond and Type IaA/B diamond with nitrogen as predominantly B centres, for improving its color. The method includes preblocking and preshaping a discoloured natural diamond to prevent its breakage in a high pressure/high temperature (HP/HT) press, placing said discoloured natural diamond in a pressure transmitting medium which is consolidated into a pill. Next, the pill is placed into a HP/HT press at elevated pressure and elevated temperature within the graphite-stable or diamond-stable range of the carbon phase diagram for a time sufficient to improve the color of said diamond. Finally, the diamond is recovered from said press. Colorless and fancy colored diamonds can be made by this method.
摘要:
A method is provided for changing the colour of a brown type IIa diamond from brown to colourless. The method involves subjecting the diamond to selected conditions of elevated temperature and elevated pressure to produce the colour change.
摘要:
The present invention relates to method of improving the optical properties of diamond at low pressures and more specifically to a method of producing a CVD diamond of a desired optical quality which includes growing CVD diamond and raising the temperature of the CVD diamond from about 1400 °C to about 2200 °C at a pressure of from about 1 to about 760 torr outside the diamond stability field in a reducing atmosphere for a time period of from about 5 seconds to about 3 hours.
摘要:
A method is provided for changing the colour of a brown type IIa diamond from brown to pink. The method involves subjecting the diamond to selected conditions of elevated temperature and elevated pressure to produce the colour change.