They are kept separate from other diamonds from the very first moment they are unearthed - their carat weight
of at least three carats, though many are much larger, and singular beauty instantly setting them apart as truly remarkable.
He pointed out that Omani law prohibited sale of the precious stones, their display or possession unless accompanied by a receipt or card with the coloured stones, mentioning the name of the stone, its weight, carat weight
, colour and, if possible, the level of exposure to any kind of treatment.
This course comprehensively expanded my knowledge of diamonds and coloured stones, as well as the technical expertise and practical skills required to evaluate gemstones using the 4Cs (colour, clarity, cut, and carat weight
With blue diamonds graded by a combination of colour, clarity, cut and carat weight
, the Okavango Blue could still fetch a price similar or close to that of the bigger stones.
The session also focused on educating attendees on how combinations of colour, clarity, cut and carat weight
determine value and translate diamond characteristics into features and benefits.
Nirupa Bhatt, Managing Director of GIA India and the Middle East, shared insights on diamonds, colored gems and pearls, including the famous 4Cs of diamond quality - color, clarity, cut and carat weight
, and the GIA 7 Pearl Value FactorsaAaAo.
However, as a scientist working at the Gemological Institute of America, Smith was able to examine 46 type IIb diamonds that were among the thousands of diamonds that come through the GIA's offices each day to be graded according to what is known as the four Cs -- cut, clarity, carat weight
There are four things that really matter when purchasing a diamond - the 4Cs: carat weight
, cut, colour and clarity.
The four most important factors in determining the value of a diamond are its clarity, color, cut and carat weight
(one carat is about 200 milligrams).
For example, with jewelry, especially the hot, colored diamond area, a carat weight
of a stone is easy to extrapolate to see how that market is doing in those particular stones.
She covers shape and cutting style, carat weight
, color, clarity and transparency, cut quality, star and cat's-eye stones, treatments, synthetic stones, and deceptive practices, followed by descriptions of specific gemstones, with broad price ranges, and tips on caring for gems.
On paper, a stone can rank highly on the famous "4 Cs" - colour, cut, clarity and carat weight
- but might still reflect black, indicating that it is fake or has been improperly cut.