What 2/2, 2/3 and 3/3 mean

In a common Russian notation for faceted sapphires, the first number usually indicates the color group and the second the clarity or defect group. Within a single system, a lower group number indicates a higher formal grade.

2/2

Color group two and clarity group two under the classification used.

2/3

Color group two and clarity group three: the color has a higher grade, while inclusions are more noticeable.

3/3

Color group three and clarity group three within the same scale.

A 5/5 notation needs clarificationNumbers can refer to different scales for different stones and documents. You cannot automatically compare “5/5” with “2/2” for a sapphire until the standard is known. Numerical diamond grades can also indicate color and clarity, but belong to a different classification system.

Color is the main factor

Hue, tone, saturation and the evenness of color distribution are assessed. GIA notes that the most highly valued blue sapphires range from velvety blue to violetish blue, with medium to medium-dark tone and strong saturation, without becoming excessively dark.

  • Look at the stone in daylight and warm artificial light.
  • Rotate the jewelry: excessively dark areas should not make the stone appear lifeless.
  • Compare paired stones: their color and brightness should be consistent.

Clarity and natural inclusions

Natural sapphires usually contain inclusions. These may look like fine needles, crystals, “fingerprints,” color zones or bands. What matters most is how visible they are and how they affect beauty and durability, rather than their complete absence.

Very high transparency is rare. Some minute inclusions create a valued velvety effect without critically reducing transparency.

Cut, weight and treatment

A good cut returns light evenly and avoids a large, lifeless dark area. Weight is stated in carats. Ask separately whether the sapphire has been heat-treated: heating is common, while an absence of indications of heating, confirmed by an independent laboratory, can make a stone rarer.

Questions to ask before buyingIs the stone natural? Has it been treated? Which standard defines the color and clarity groups? Is there a laboratory report for a large or expensive gemstone?

Professional sources

GIA: Sapphire Quality Factors ↗

GIA: Sapphire Buyer’s Guide ↗

Gokhran of Russia: sapphire classification characteristics ↗