Carat vs. Color  Length*  Width*

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

1 Ct Tourmaline (Emerald)

versus image

1 Ct Sapphire (Round)

Light Red
6.95×5.15 mm 5.98×5.98 mm
Actual size of 1ct Tourmaline
Actual size of 1ct Sapphire

x Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Red 1ct Tourmaline on a ring
64 mm
Right finger image
Ring on a right finger
Blue 1ct Sapphire on a ring
Your settings
Skin tone
Ring diameter
16.9 mm
Ring width
3.0 mm
Finger length
64 mm
Ring diameter: 16.9 mm
Actual sizes of 1ct Tourmaline Emerald (6.95×5.15mm, Light Red) and 1ct Sapphire Round (5.98×5.98mm, 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.

Face-up Size

All things being equal, Sapphire will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (4 vs. 3.1 - this means it's "heavier" compared to Tourmaline 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.

1 Ct Tourmaline (Emerald) 1 Ct Sapphire (Round)
6.95×5.15 mm → 33.29 mm² vs. 28.09 mm² ← 5.98×5.98 mm
Face-up size outline
Face-up size outline
1ct Tourmaline Emerald (6.95×5.15mm)
1ct Sapphire Round (5.98×5.98mm)
Difference: 19% (5.2 mm²)
1ct Tourmaline Emerald (6.95×5.15mm) has approx. 19% more face-up area than 1ct Sapphire Round (5.98×5.98mm).

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