What is IIa diamond?
What is a Type IIa Diamond? Type IIa diamonds have no measurable nitrogen or boron impurities. They are the most chemically pure diamonds and have the highest thermal conductivity. Type IIa diamonds are often colorless or near colorless. They can also be gray, light brown, light yellow, or light pink.
What is the difference between type I and type II diamond?
Type II diamonds have no measurable nitrogen impurities. Type II diamonds absorb in a different region of the infrared, and transmit in the ultraviolet below 225 nm, unlike Type I diamonds. They also have differing fluorescence characteristics.
What is GIA grade?
The GIA scale measures the color grade of diamonds, size, position, and nature of the diamond, as well as the other three C’s of diamond grading: carat, clarity, and diamond “cut” grade. There are 11 different grades in the GIA diamond grading scale.
How can you tell what type of diamond you have?
GIA uses a Fourier transform infrared (FTIR) spectrometer an instrument which measures the absorption of electromagnetic radiation of the diamond. The result is an absorption spectrum from which diamond type can be determined. When a diamond arrives at a GIA lab, it is tested on a FTIR spectrometer.
What is Type IIa lab grown diamond?
Type IIa diamonds are the most valued and the purest type of diamonds. They contain either very little or no nitrogen atoms and that leads them to colorless grade. They represent only 1% – 2% of all mined diamonds in the world. Most of the lab-grown diamonds are Type IIa.
Is diamond IIa a CVD?
Colorless and near-colorless CVD synthetic diamonds are usually type IIa, while only 2% of natural gem diamonds are type IIa. Type IIa diamonds are characterized by high purity (low nitrogen) and transparency in specific parts of the ultraviolet and infrared optical spectrum.
Are pink diamonds Type IIa?
Type IIa diamonds These are said to be the purest diamonds chemically since they have no measurable amount of boron or nitrogen impurities in the crystal structure. Examples of these diamonds include famous pink diamonds such as the Daria-i-Noor and Noor-ul-Ain.
What is GIA diamond?
A GIA Diamond is a diamond certified by the Gemological Institute of America, the World’s foremost authority in independent third-party diamond certification. GIA diamonds are examined by a minimum of four highly trained diamond graders and gemologists.
How do you grade a diamond GIA?
A GIA Diamond Grading Report includes an assessment of the 4Cs – Color, Clarity, Cut and Carat Weight – along with a plotted diagram of its clarity characteristics and a graphic representation of the diamond’s proportions.
What is the rarest type of diamond?
red diamond
Quick answer: The rarest diamond color is the red diamond. They are so rare that less than 30 true red diamonds are known to exist. They can cost $1 million per carat and most of the red diamonds in existence are less than ½ a carat in size.
Which is best quality diamond?
Flawless is the top grade in the GIA Clarity Grading System. Diamonds graded Flawless don’t have visible inclusions or blemishes when examined under 10-power (10X) magnification by a skilled and experienced grader. As clarity increases, and if all other value factors are equal, diamond price per carat also increases.
Are all lab grown diamonds type 2a?
Every colorless lab grown diamond is classified as Type IIa—the purest type of diamond. Less than 2 percent of the world’s mined diamonds are pure enough to be classified as Type IIa. Beyond those two points, there is no difference between lab grown and mined diamonds.