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0.18ct Diamond (Baguette, 4.08×2.72mm, White) vs 3.66ct Sapphire (Emerald, 9.77×6.94mm, Dark Bluish Green)


Quick summary: When looked from above (face-up position), 3.66ct Sapphire (9.77×6.94mm, emerald cut) appears 5.7 times larger than 0.18ct Diamond (4.08×2.72mm, baguette cut). See below how they compare side-by-side on a ring and finger.

0.18ct Diamond (baguette cut)
vs
 3.66ct Sapphire (emerald cut)
white
 
dark bluish green
4.08×2.72 mm 9.77×6.94 mm
actual size
Actual size of 0.18ct Diamond (baguette cut, 4.08×2.72mm, White color)   Actual size of 3.66ct Sapphire (emerald cut, 9.77×6.94mm, Dark Bluish Green color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
White 0.18ct Diamond (baguette cut, 4.08×2.72mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Bluish Green 3.66ct Sapphire (emerald cut, 9.77×6.94mm) 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
 17% vs 42%
Saved...
Ring diameter: 16.9 mm
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Actual sizes of 0.18ct Diamond Baguette (4.08×2.72mm, White) and 3.66ct Sapphire Emerald (9.77×6.94mm, Dark Bluish Green) 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

All things being equal, Sapphire will face-up smaller than Diamond for a given carat weight, because it has higher specific gravity (4 vs. 3.52 - this means it's "heavier" compared to Diamond of the same size). Face-up size also depends heavily on 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.


0.18 Ct Diamond (Baguette) 3.66 Ct Sapphire (Emerald)
4.08×2.72 mm vs 9.77×6.94 mm
11.1 mm²   63.06 mm²
Face-up size outline for 3.66ct Sapphire (9.77×6.94mm, emerald cut)
Face-up size outline for 0.18ct Diamond (4.08×2.72mm, baguette cut)
0.18ct Diamond Baguette (4.08×2.72mm)
3.66ct Sapphire Emerald (9.77×6.94mm)
Difference: 468% (51.96 mm²)
3.66ct Sapphire (Emerald, 9.77×6.94mm) has approx. 468% more face-up area than 0.18ct Diamond (Baguette, 4.08×2.72mm). In other words, it's 5.68x larger.


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