Diamonds are a girl's best friend, and they come in many shapes, sizes, and colors. But did you know that there is a special type of diamond called Type IIb? These diamonds are rare and have unique properties that make them stand out from other diamonds. In this article, we'll explore what makes Type IIb diamonds so special, how to identify them, and how to determine their value. Type IIb diamonds are the rarest type of diamond, making up only 0.1% of all diamonds mined.
They are distinguished by their unique chemical composition, which contains trace amounts of boron and no nitrogen. This combination gives them a unique ultraviolet (UV) light response, making them appear blue under UV light. Type IIb diamonds also have a unique phosphorescence and fluorescence response. When exposed to ultraviolet light, they will emit a blue glow that can last for several minutes after the light source is removed.
This phenomenon is known as phosphorescence and is caused by the diamond's ability to absorb and store energy from the UV light. The GIA (Gemological Institute of America) has developed a rating system for diamonds that includes four categories: color, clarity, cut quality, and carat weight. Type IIb diamonds are rated differently than other diamonds because of their unique properties. For example, they may appear yellowish or brownish in color due to their lack of nitrogen, but this does not affect their GIA rating.
Instead, they are rated based on their fluorescence and phosphorescence response. When it comes to determining the value of Type IIb diamonds, there are several factors to consider. The most important factor is the diamond's cut quality. A well-cut diamond will have more sparkle and brilliance than a poorly cut one.
Additionally, the color grade of the diamond will also affect its value. Type IIb diamonds can range from colorless to yellowish or brownish in color due to their lack of nitrogen, but they can still be graded on the GIA scale. In addition to the GIA rating system, there are other ways to identify Type IIb diamonds. One way is to use a diamond tester or black light to detect the diamond's fluorescence or phosphorescence response.
Another way is to look for light scattering defects such as haze or transparency that can indicate a Type IIb diamond. Finally, some jewelers may use a Presidium Diamond Tester to identify Type IIb diamonds. Type IIb diamonds are truly unique gems that have special properties that make them stand out from other diamonds. They are rare and valuable, so it's important to understand how to identify them and determine their value before making any purchase decisions. With the right knowledge and tools, you can be sure you're getting the best possible deal on your Type IIb diamond.
