×
carat vs. color  length*  width*
  ×

(or examine a )
* size in mm (optional)

2ct Tanzanite (Round, 8.03×8.03mm, Blue) vs 2.5ct Sapphire (Round, 8.11×8.11mm, Dark Violet)


Quick summary: When looked from above (face-up position), 2.5ct Sapphire (8.11×8.11mm, round cut) appears 2% larger than 2ct Tanzanite (8.03×8.03mm, round cut). See below how they compare side-by-side on a ring and finger.

2ct Tanzanite (round cut)
vs
 2.5ct Sapphire (round cut)
blue
 
dark violet
8.03×8.03 mm 8.11×8.11 mm
actual size
Actual size of 2ct Tanzanite (round cut, 8.03×8.03mm, Blue color)   Actual size of 2.5ct Sapphire (round cut, 8.11×8.11mm, Dark Violet color)
 
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Blue 2ct Tanzanite (round cut, 8.03×8.03mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Dark Violet 2.5ct Sapphire (round cut, 8.11×8.11mm) 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
 48% vs 48%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 2ct Tanzanite Round (8.03×8.03mm, Blue) and 2.5ct Sapphire Round (8.11×8.11mm, Dark Violet) 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 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.


2 Ct Tanzanite (Round) 2.5 Ct Sapphire (Round)
8.03×8.03 mm vs 8.11×8.11 mm
50.64 mm²   51.66 mm²
Face-up size outline for 2.5ct Sapphire (8.11×8.11mm, round cut)
Face-up size outline for 2ct Tanzanite (8.03×8.03mm, round cut)
2ct Tanzanite Round (8.03×8.03mm)
2.5ct Sapphire Round (8.11×8.11mm)
Difference: 2% (1.02 mm²)
2.5ct Sapphire (Round, 8.11×8.11mm) has approx. 2% more face-up area than 2ct Tanzanite (Round, 8.03×8.03mm).


Popular comparisons: