Doubravka Tamara. Diamonds. August 08th , 2017.
In short, chances of forming diamonds from coal, are very remote. So it is believed that most of the diamonds are not formed from coal.
In 1673, under the orders of King Louis XIV, the blue gemstone was cut to enhance its brilliance. The newly cut gem weighed 67.80 carats. The King of France officially named it 'Blue Diamond of the Crown'. He wore it around his neck on a long ribbon. Since then, it was known as the French Blue or the Tavernier Blue.
The simple yet sophisticated lines of marquise diamond engagement rings make them one of the most popular choices for bridal sets as well as other accented rings and solitaires. Knowing what makes this particular diamond shape special and how it affects the other characteristics of the gem is crucial for couples choosing a marquise stone.
To determine the blemish or the particular inclusion in the diamonds, they are viewed under 10x magnification under controlled lighting. According to the GIA Clarity Grading System a diamond can be graded in 11 diamond clarity ratings or grades that range from flawless or internally flawless(FL or IL), VVS1 and VVS2 (Very, Very, Small inclusions), VS1 and VS2 (Very Small), SI1 and SI2 (slightly included), I1,I2 and I3 (Included diamonds). Many of these characteristics are visible to the naked eye, especially in the case of included diamonds, while flawless diamonds do not show any problems even under the magnification.
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