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1.35ct Spinel (Round, 6.84×6.84mm, Red) vs 3.99ct Tourmaline (Cushion, 9.66×9.66mm, Light Yellow)


Quick summary: When looked from above (face-up position), 3.99ct Tourmaline (9.66×9.66mm, cushion cut) appears 2.3 times larger than 1.35ct Spinel (6.84×6.84mm, round cut). See below how they compare side-by-side on a ring and finger.

1.35ct Spinel (round cut)
vs
 3.99ct Tourmaline (cushion cut)
red
 
light yellow
6.84×6.84 mm 9.66×9.66 mm
actual size
Actual size of 1.35ct Spinel (round cut, 6.84×6.84mm, Red color)   Actual size of 3.99ct Tourmaline (cushion cut, 9.66×9.66mm, Light Yellow color)
Actual size is set for screen
Ring: Skin tone:
Ring width: 3.0 mm
Left finger image
Ring on left finger
Red 1.35ct Spinel (round cut, 6.84×6.84mm) on a left ring and finger
64 mm
Right finger image
Ring on a right finger
Light Yellow 3.99ct Tourmaline (cushion cut, 9.66×9.66mm) 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
 41% vs 58%
Saved...
Ring diameter: 16.9 mm
USA UK Asia EU1 EU2
Actual sizes of 1.35ct Spinel Round (6.84×6.84mm, Red) and 3.99ct Tourmaline Cushion (9.66×9.66mm, Light Yellow) 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, Spinel will face-up smaller than Tourmaline for a given carat weight, because it has higher specific gravity (3.6 vs. 3.06 - 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.


1.35 Ct Spinel (Round) 3.99 Ct Tourmaline (Cushion)
6.84×6.84 mm vs 9.66×9.66 mm
36.75 mm²   83.98 mm²
Face-up size outline for 3.99ct Tourmaline (9.66×9.66mm, cushion cut)
Face-up size outline for 1.35ct Spinel (6.84×6.84mm, round cut)
1.35ct Spinel Round (6.84×6.84mm)
3.99ct Tourmaline Cushion (9.66×9.66mm)
Difference: 129% (47.23 mm²)
3.99ct Tourmaline (Cushion, 9.66×9.66mm) has approx. 129% more face-up area than 1.35ct Spinel (Round, 6.84×6.84mm). In other words, it's 2.29x larger.


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