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18ct Diamond (Round, 17.03×17.03mm, White) vs 1ct Diamond (Round, 6.5×6.5mm, White)


Quick summary: When looked from above (face-up position), 18ct Diamond (17.03×17.03mm, round cut) appears 6.9 times larger than 1ct Diamond (6.5×6.5mm, round cut). See below how they compare side-by-side on a ring and finger.

18ct Diamond (round cut)
vs
 1ct Diamond (round cut)
white
 
white
17.03×17.03 mm 6.5×6.5 mm
actual size
Actual size of 18ct Diamond (round cut, 17.03×17.03mm, White color)   Actual size of 1ct Diamond (round cut, 6.5×6.5mm, White color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 18ct Diamond (round cut, 17.03×17.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
White 1ct Diamond (round cut, 6.5×6.5mm) on a right ring and finger
Your settings
Ring
 Gold
Skin tone
 Light
Ring diameter
 16.9 mm
Ring width
 3.0 mm
Finger length
 64 mm
Finger coverage
 101% vs 39%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 18ct Diamond Round (17.03×17.03mm, White) and 1ct Diamond Round (6.5×6.5mm, White) as they would appear on a ring and finger. Adjust the ring and finger size to get an idea of how these gemstones would look on your finger.

Where to buy?

For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile

Face-up Size

The face-up size depends on the shape of the gem, its weight and the proportions of the cut. Face-up area is a measure of the size of the gem when viewed from above (as set in a ring). It tells you how big the gem is at the girdle plane.


18 Ct Diamond (Round) 1 Ct Diamond (Round)
17.03×17.03 mm vs 6.5×6.5 mm
227.78 mm²   33.18 mm²
Face-up size outline for 18ct Diamond (17.03×17.03mm, round cut)
Face-up size outline for 1ct Diamond (6.5×6.5mm, round cut)
18ct Diamond Round (17.03×17.03mm)
1ct Diamond Round (6.5×6.5mm)
Difference: 586% (194.6 mm²)
18ct Diamond (Round, 17.03×17.03mm) has approx. 586% more face-up area than 1ct Diamond (Round, 6.5×6.5mm). In other words, it's 6.86x larger.


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