4ct Diamond (Oval, 12.89×8.59mm, White) vs 4.5ct Sapphire (Oval, 12.48×8.32mm, Dark Blue)
Quick summary: When looked from above (face-up position), 4ct Diamond (12.89×8.59mm, oval cut) appears 7% larger than 4.5ct Sapphire (12.48×8.32mm, oval cut). See below how they compare side-by-side on a ring and finger.
| 4ct Diamond (oval cut) |
vs
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4.5ct Sapphire (oval cut) |
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white |
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| 12.89×8.59 mm | 12.48×8.32 mm | |
| actual size | ||
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Actual size is set for screen
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Ring:
Skin tone:
Ring width: 3.0 mm
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64 mm |
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Actual sizes of
4ct Diamond Oval (12.89×8.59mm, White)
and
4.5ct Sapphire Oval (12.48×8.32mm, Dark 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?
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 Diamond for a given
carat weight, because it has higher specific gravity
(4 vs. 3.52 - this means it's "heavier" compared to Diamond 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.
| 4 Ct Diamond (Oval) | 4.5 Ct Sapphire (Oval) | |
| 12.89×8.59 mm | vs | 12.48×8.32 mm |
| 90.79 mm² | 85.14 mm² |
| 4ct Diamond Oval (12.89×8.59mm) | |
| 4.5ct Sapphire Oval (12.48×8.32mm) | |
| Difference: 7% (5.65 mm²) |
4ct Diamond (Oval, 12.89×8.59mm) has approx. 7% more face-up area than 4.5ct Sapphire (Oval, 12.48×8.32mm).
Popular comparisons:
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 2ct Diamond (Oval, White, 10.23 x 6.82)
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 5ct Diamond (Oval, White, 13.88 x 9.25)
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 2ct Diamond (Round, White, 8.19 x 8.19)
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 4ct Diamond (Emerald, White, 10.61 x 7.86)
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 5ct Diamond (Cushion, White, 9.96 x 9.96)
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 4ct Topaz (Oval, Blue, 12.51 x 8.34)
- 4ct Diamond (Oval, White, 12.89 x 8.59) vs. 3.2ct Diamond (Oval, White, 11.96 x 7.97)