What are the different grades of gemstones?

The “Four Cs” of gem grading stand for color, clarity, cut, and carat (weight). Gemologists grade gemstones based on these properties. I’ll explain how we gemologists evaluate each of these properties and how consumers can use this information.

What is the best grade for gemstones?

While there is no universal grading system, many gemstone beads are graded based on their quality, color, cut, and clarity (somewhat similar to how diamonds are graded). Gemstone grading is assigned by letter. AAA is the highest grade while D is the lowest.

How are gemstones rated?

As with diamonds, colored gemstones are valued and rated with the 4 C’s: cut, clarity, color and carat. Once the gemstone has been evaluated on these four criteria, a final grade is given to the gem. The final grade falls on a scale of AAA – D, with AAA being near perfect and D being a poor quality gemstone.

What are Type 3 gemstones?

Type 3 gemstones includes gems such as green emerald, red beryl (bixbite) and varieties of tourmaline, particular blue tourmaline (Pariaba tourmaline and Indicolite tourmaline) red (rubellite) tourmaline, as well as pink, bi-color tourmaline and multi-color or watermelon tourmaline.

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What are the 5 main gemstones?

The five traditional cardinal gems are:

  • amethyst (purple) – Rare and precious in the Old World until large deposits were found in Brazil.
  • diamond (white)
  • emerald (green)
  • ruby (red)
  • sapphire (blue)

What is AAA gemstone grade?

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. AA – Semi clean, well cut and polished gemstones are graded as AA.

How do you tell what grade A crystal is?

As well as size – is it a small piece or a large piece ? – you also have to consider quality, and in rough stone quality is usually indicated by “1st Quality” being the highest grade and then “2nd Quality” being a grade lower and then “3rd Quality” usually being the lowest grade of mineral or rock.

What are Type 2 gemstones?

Type 2 gemstones include amethyst, andalusite, alexandrite, garnet and peridot amongst others. It is worth noting that tourmalines are included in this type, except if they are green, pink or watermelon.

What is a quality gemstone?

Grading Gemstones and Diamonds

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 it mean AAA quality?

What Is AAA? 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.

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What is VVS emerald?

VVS: very, very small inclusions. VS: very small inclusions.

What is a Type 1 gemstone?

Type 1 Gemstones are gemstones that are normally found to be clean. This includes gems such as Amethyst, Aquamarine, Blue Topaz, Citrine, Kunzite, Tanzanite, Yellow Beryl, Yellow Chrysoberyl and Diamond.

What is a VVS gem?

Very, Very Slightly Included category (VVS) diamonds have minute inclusions that are difficult for a skilled grader to see under 10x magnification. The VVS category is divided into two grades; VVS1 denotes a higher clarity grade than VVS2.

What is the rarest gem?

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.

What is the most expensive birthstone?

1. Diamond. Not surprisingly, the April birthstone is one of the most expensive jewels available today. Not only has it become the eternal symbol of undying love, but is also an exceptionally strong gem with a rating of 10 on the Mohs scale.

What is the cheapest gemstone?

10 Most Affordable Gemstones

  • Amethyst. Belonging to the quartz family, amethyst is both abundant and incredibly popular. …
  • Agate. A member of the quartz family and a variety of the chalcedony, agate gemstones come in a variety of colors. …
  • Citrine. …
  • Garnet. …
  • Hematite. …
  • Onyx. …
  • Peridot. …
  • Rose Quartz.