The “Four Cs” of gem grading stand for color, clarity, cut, and carat (weight). Gemologists grade gemstones based on these properties. … However, first you must understand that gemstones are graded by the rarity of their features.
What does grade A crystal mean?
Some crystals that are of excellent quality and exhibit or display all of the expected characteristics of that stone are graded AA. … These are natural pieces of stone that have not been tumbled and the price of such pieces is influenced by many things.
What is the highest quality of gems?
These gemstones made it to the list because they have the highest prices per carat.
- Tanzanite—$1,200 per carat. (Image Courtesy of Geology) …
- Black Opal—$9,500 per carat. …
- Red Beryl—$10,000 per carat. …
- Musgravite—$35,000 per carat. …
- Alexandrite—$70,000 per carat. …
- Emerald—$305,000 per carat. …
- Ruby—$1.18 million per carat.
What is gemstone quality?
Gemstone pricing and value are governed by factors and characteristics in the quality of the stone. These characteristics include clarity, rarity, freedom from defects, the beauty of the stone, as well as the demand for such stones. There are different pricing influencers for both colored gemstones, and for diamonds.
What is GEM clarity?
What is Gemstone Clarity? Clarity is one of the Four Cs of gemstone grading. A gemstone’s clarity grade indicates the relative absence of inclusions (materials trapped inside the gem), fractures, and blemishes (surface imperfections) that affect its appearance and structural integrity.
Is Grade A better than grade AAA?
AAA – “AAA” grade is assigned to a gemstone that is considered to “being near perfect.” Though these stones do show some variation in colour, they are clean, well cut and polished. … A – Reasonably clean and well cut gemstones that have noticeable variations are graded A.
What is AAA quality?
AAA is the highest possible rating that may be assigned to an issuer’s bonds by any of the major credit rating agencies. AAA-rated bonds have a high degree of creditworthiness because their issuers are easily able to meet financial commitments and have the lowest risk of default.
What is the rarest gem on earth?
Painite : Not just the rarest gemstone, but also the rarest mineral on earth, Painite holds the Guinness World Record for it. After its discovery in the year 1951, there existed only 2 specimens of Painite for the next many decades. By the year 2004, there were less than 2 dozens known gemstones.
Which precious stone is the most expensive?
The Most Expensive Gemstone in the World: The Blue Diamond
- Are worth $3.93 million per carat.
- Are rare to find in a flawless sample.
- Cause a huge stir in the jewelry industry when one goes to auction.
What Stone is the rarest?
Painite was first discovered by British gemologist Arthur Charles Davy Pain in 1951 and recognized as a new mineral in 1957. For many years only one specimen of the dark red crystal was in existence, housed at the British Museum in London, making it the world’s rarest gemstone.
What are the 7 precious stones?
Strictly speaking the precious stones are only seven in number—the diamond, the pearl, the ruby, the sapphire, the emerald, the oriental catseye, and the alexandrite; but to these are often added the so-called semi-precious stones—such as the amethyst, the topaz, the tourmaline, the aquamarine, the chrysoprase, the …
When a guy says you are a gem?
When someone says “you’re a gem” they usually mean that you are special or unique in some way or that you’ve done something special or unexpected. A “gem” is a gemstone, and each gemstone is both unique and valuable (though some are more valuable than others.) In normal usage, this is a positive statement.
What are the 4 precious stones?
The four most sought-after precious gemstones are diamonds, sapphires, emeralds, and rubies. gemstone can help you decide what you want to say with your custom piece of jewelry.
How can you tell a good quality gem?
On top of colour, by far the most important judgement you need to make, you can look at the clarity and transparency of a coloured stone, the symmetry of the cut, its brilliance (i.e. if it sparkles a lot): all indications of a higher quality gem.
What Crystal is good for clarity?
Which are the Best Stones for Focus and Clarity?
- Fluorite (Stone of Discernment and Aptitude) …
- Clear Quartz (The Master Healer) …
- Tiger’s Eye (Stone of the Mind) …
- Sodalite (Harmonising Stone) …
- Amazonite (Stone of Hope, Abundance, Courage and Truth) …
- Smokey Quartz (Stone of Cooperation) …
- Hematite (Stone for the Mind)
What is the best stone clarity?
For diamonds over 2 carats, a clarity grade of VS2 or higher is the safest bet for avoiding any signs of visible inclusions. In diamonds between 1 and 2 carats, clarity grades of SI1 or better will not have inclusions easily visible to the naked eye.