5.5ct Benitoite (Marquise, 17.7×8.85mm, Blue) vs 5.5ct Tanzanite (Marquise, 18.2×9.1mm, Blue)
Quick summary: When looked from above (face-up position), 5.5ct Tanzanite (18.2×9.1mm, marquise cut) appears 6% larger than 5.5ct Benitoite (17.7×8.85mm, marquise cut). See below how they compare side-by-side on a ring and finger.
| 5.5ct Benitoite (marquise cut) |
vs
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5.5ct Tanzanite (marquise cut) |
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blue |
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| 17.7×8.85 mm | 18.2×9.1 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
5.5ct Benitoite Marquise (17.7×8.85mm, Blue)
and
5.5ct Tanzanite Marquise (18.2×9.1mm, 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, Benitoite will face-up smaller than Tanzanite for a given
carat weight, because it has higher specific gravity
(3.65 vs. 3.35 - this means it's "heavier" compared to Tanzanite 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.
| 5.5 Ct Benitoite (Marquise) | 5.5 Ct Tanzanite (Marquise) | |
| 17.7×8.85 mm | vs | 18.2×9.1 mm |
| 111.22 mm² | 117.59 mm² |
| 5.5ct Benitoite Marquise (17.7×8.85mm) | |
| 5.5ct Tanzanite Marquise (18.2×9.1mm) | |
| Difference: 6% (6.37 mm²) |
5.5ct Tanzanite (Marquise, 18.2×9.1mm) has approx. 6% more face-up area than 5.5ct Benitoite (Marquise, 17.7×8.85mm).
Popular comparisons:
- 1.75ct Benitoite (Marquise, Dark Blue, 12.26 x 6.13) vs. 3.12ct Sinhalite (Cabochon, Brown, 10.47 x 6.98)
- 1ct Benitoite (Marquise, Blue, 10.18 x 5.09) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 2.7ct Ruby (Pear, Red, 10 x 7) vs. 3ct Ruby (Emerald, Red, 9 x 7)
- 1.5ct Tourmaline (Round, Light Red, 7.45 x 7.45) vs. 1.5ct Sapphire (Round, Light Blue, 6.84 x 6.84)
- 1ct Kyanite (Oval, Blue, 7.77 x 5.18) vs. 1ct Tanzanite (Oval, Blue, 8.07 x 5.38)
- 1ct Aquamarine (Oval, Light Blue, 8 x 6) vs. 1ct Spinel (Oval, Gray, 8 x 6)
- 6ct Morganite (Cushion, Light Red, 12 x 10) vs. 3.5ct Sapphire (Cushion, Blue, 8.49 x 8.49)
- 1.16ct Diamond (Round, White, 6.82 x 6.85) vs. 1.2ct Diamond (Round, White, 6.82 x 6.86)
- 1ct Alexandrite (Round, Bluish Green, 6.14 x 6.14) vs. 1ct Emerald (Emerald, Yellowish Green, 7.28 x 5.39)