carat vs. color  length*  width*

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

1.5 Ct Tourmaline (Round)


1.5 Ct Sapphire (Round)

light red
light blue
7.45×7.45 mm 6.84×6.84 mm
actual size
Actual size of 1.5ct Tourmaline   Actual size of 1.5ct Sapphire
Actual size is set for screen Change
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Light Red 1.5ct Tourmaline on a ring
64 mm
Right finger image
Ring on a right finger
Light Blue 1.5ct 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 1.5ct Tourmaline Round (7.45×7.45mm, Light Red) and 1.5ct Sapphire Round (6.84×6.84mm, Light 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?

JamesAllen → high-quality blue Sapphires, high-end jewelry and competitive prices. Highly recommended.
Amazon → usually offers a good selection from many different vendors. Worth a check.

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.

1.5 Ct Tourmaline (Round) 1.5 Ct Sapphire (Round)
7.45×7.45 mm vs 6.84×6.84 mm
43.59 mm²   36.75 mm²
Face-up size outline
Face-up size outline
1.5ct Tourmaline Round (7.45×7.45mm)
1.5ct Sapphire Round (6.84×6.84mm)
Difference: 19% (6.84 mm²)
1.5ct Tourmaline Round (7.45×7.45mm) has approx. 19% more face-up area than 1.5ct Sapphire Round (6.84×6.84mm).

Popular comparisons:

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Actual size is currently adjusted to screen.

If your screen (phone, tablet, or monitor) is not in diagonal, then the actual size of a gem, ring and finger will not be shown correctly.