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0.25ct Ruby (Oval, 4.77×3.18mm, Red) vs 0.7ct Tanzanite (Round, 5.66×5.66mm, Blue)


Quick summary: When looked from above (face-up position), 0.7ct Tanzanite (5.66×5.66mm, round cut) appears 2 times larger than 0.25ct Ruby (4.77×3.18mm, oval cut). See below how they compare side-by-side on a ring and finger.

0.25ct Ruby (oval cut)
vs
 0.7ct Tanzanite (round cut)
red
 
blue
4.77×3.18 mm 5.66×5.66 mm
actual size
Actual size of 0.25ct Ruby (oval cut, 4.77×3.18mm, Red color)   Actual size of 0.7ct Tanzanite (round cut, 5.66×5.66mm, Blue color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 0.25ct Ruby (oval cut, 4.77×3.18mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Blue 0.7ct Tanzanite (round cut, 5.66×5.66mm) 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
 19% vs 34%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 0.25ct Ruby Oval (4.77×3.18mm, Red) and 0.7ct Tanzanite Round (5.66×5.66mm, Blue) 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, Ruby will face-up smaller than Tanzanite for a given carat weight, because it has higher specific gravity (4 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.


0.25 Ct Ruby (Oval) 0.7 Ct Tanzanite (Round)
4.77×3.18 mm vs 5.66×5.66 mm
12.44 mm²   25.16 mm²
Face-up size outline for 0.7ct Tanzanite (5.66×5.66mm, round cut)
Face-up size outline for 0.25ct Ruby (4.77×3.18mm, oval cut)
0.25ct Ruby Oval (4.77×3.18mm)
0.7ct Tanzanite Round (5.66×5.66mm)
Difference: 102% (12.72 mm²)
0.7ct Tanzanite (Round, 5.66×5.66mm) has approx. 102% more face-up area than 0.25ct Ruby (Oval, 4.77×3.18mm). In other words, it's 2.02x larger.


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