40ct Sapphire (Cabochon, 23.4×15.6mm, Blue) vs 40ct Amethyst (Oval, 29.67×19.78mm, Violet)
Quick summary: When looked from above (face-up position), 40ct Amethyst (29.67×19.78mm, oval cut) appears 61% larger than 40ct Sapphire (23.4×15.6mm, cabochon cut). See below how they compare side-by-side on a ring and finger.
| 40ct Sapphire (cabochon cut) |
vs
|
40ct Amethyst (oval cut) |
|
blue |
|
|
| 23.4×15.6 mm | 29.67×19.78 mm | |
| actual size | ||
|
|
|
|
|
||
Actual size is set for screen
|
Ring:
Skin tone:
Ring width: 3.0 mm
|
|
64 mm |
|
|
|||||||||||||||||
|
|||||||||||||||||||||
Actual sizes of
40ct Sapphire Cabochon (23.4×15.6mm, Blue)
and
40ct Amethyst Oval (29.67×19.78mm, 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 Amethyst for a given
carat weight, because it has higher specific gravity
(4 vs. 2.65 - this means it's "heavier" compared to Amethyst 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.
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.
| 40 Ct Sapphire (Cabochon) | 40 Ct Amethyst (Oval) | |
| 23.4×15.6 mm | vs | 29.67×19.78 mm |
| 299.33 mm² | 481.24 mm² |
| 40ct Sapphire Cabochon (23.4×15.6mm) | |
| 40ct Amethyst Oval (29.67×19.78mm) | |
| Difference: 61% (181.91 mm²) |
40ct Amethyst (Oval, 29.67×19.78mm) has approx. 61% more face-up area than 40ct Sapphire (Cabochon, 23.4×15.6mm).
Popular comparisons:
- 2ct Sapphire (Cabochon, Dark Blue, 8 x 6) vs. 2.27ct Sapphire (Cabochon, Light Blue, 8 x 6.1)
- 2ct Sapphire (Cabochon, Blue, 8.63 x 5.75) vs. 2ct Diamond (Cabochon, White, 9 x 6)
- 2ct Sapphire (Cabochon, Blue, 8.63 x 5.75) vs. 2ct Ruby (Oval, Red, 9.53 x 6.35)
- 5ct Sapphire (Cabochon, Dark Blue, 10 x 10) vs. 8ct Ruby (Cabochon, Red, 13.68 x 9.12)
- 3.9ct Sapphire (Cabochon, Blue, 9.5 x 7.8) vs. 2.94ct Sapphire (Cabochon, Purple, 8.25 x 6.98)
- 1.92ct Sapphire (Cabochon, Blue, 8.51 x 5.67) vs. 0.74ct Sapphire (Cabochon, Blue, 6.2 x 4.13)
- 3ct Sapphire (Cabochon, Orange, 9.87 x 6.58) vs. 3ct Sapphire (Oval, Light Orange, 8 x 10)
- 5ct Sapphire (Cabochon, Dark Blue, 10 x 10) vs. 10.3ct Amethyst (Cabochon, Dark Violet, 16 x 12)