Clarity refers to the presence or absence of blemishes (internal features) and inclusions (external features) in a diamond. The fewer the blemishes and inclusions, the higher the clarity grade and the more valuable the diamond.

The Gemological Institute of America (GIA) has developed a clarity grading system that ranges from Flawless (FL) to Included (I3).

- Flawless (FL): No blemishes or inclusions visible under 10x magnification

- Internally Flawless (IF): No blemishes visible under 10x magnification, but may have some inclusions

- Very, Very Slightly Included (VVS1, VVS2): Very few tiny inclusions that are difficult to see under 10x magnification

- Very Slightly Included (VS1, VS2): Few tiny inclusions that are visible under 10x magnification

- Slightly Included (SI1, SI2): Some inclusions that are visible under 10x magnification

- Included (I1, I2, I3): More visible inclusions that may affect the diamond's brilliance and transparency

The clarity of a diamond can have a significant impact on its price. For example, a 1-carat diamond with a VVS1 clarity grade can be worth thousands of dollars more than a diamond with an I3 clarity grade.

Cost of clarity

The cost of diamond clarity varies depending on the grade. In general, the higher the clarity grade, the more expensive the diamond.

Here is a table showing the average cost of diamonds with different clarity grades:

| Clarity Grade | Average Price per Carat |

|---|---|

| Flawless (FL) | $15,000 - $20,000 |

| Internally Flawless (IF) | $12,000 - $15,000 |

| Very, Very Slightly Included (VVS1, VVS2) | $9,000 - $12,000 |

| Very Slightly Included (VS1, VS2) | $7,000 - $9,000 |

| Slightly Included (SI1, SI2) | $5,000 - $7,000 |

| Included (I1, I2, I3) | $3,000 - $5,000 |

It is important to note that these prices are just averages. The actual price of a diamond will also depend on other factors, such as its cut, color, and carat weight.