7.5 Carat Spinel (Cabochon, 13.88×9.25mm, Red)
Color:
Actual size is set for screen
How big is a 7.5 carat cabochon-cut Spinel?
It depends on the cut parameters and length-to-width ratio, but a typical size of a 7.5ct cabochon-cut Spinel would be around 13.88×9.25 mm (±6%). The lw ratio of this Spinel is 1.5. See below how big it looks on a ring and finger.
Ring:
Skin tone:
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Ring width:
3.0 mm
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Saved...
64 mm
| Your settings | |
|---|---|
Ring |
Gold |
Skin tone |
Light |
Ring diameter |
16.9 mm |
Ring width |
3.0 mm |
Finger length |
64 mm |
Finger coverage |
55 % |
|
Saved...
|
|
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Ring diameter:
16.9 mm
|
Additional Info
Spinel is a rare gemstone that occurs in practically all colors. Because of similar properties, red and blue Spinels have often been mistaken for Rubies and Sapphires. For example, the Black Prince's Ruby is actually a Spinel.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Gem Details
|
Name:
|
Spinel |
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Shape:
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Cabochon |
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Chemical Formula:
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MgAl2O4 |
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Crystal Structure:
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Isometric |
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Hardness:
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7.5-8 |
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Specific Gravity
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3.6 |
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Carat weight:
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7.5 ct |
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Gram weight:
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1.5 g (0.0529 ounces) |
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Points:
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750 pts |
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Length:
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13.88 mm |
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Width:
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9.25 mm |
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Est. face-up size:
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105.28 mm² |
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Volume:
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416.67 mm³ |
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Length-to-width ratio:
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1.5 |
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Refractive Index:
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1.712 - 1.736 |
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Luster:
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Vitreous |
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Wearability:
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Excellent |
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Care Instructions:
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No special or unusual care |
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Color:
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Spinel can be found in the following colors:
                               
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Birthstone:
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Spinel is not an official birthstone of any month |
Popular comparisons:
- 6.7ct Spinel (Cabochon, Red, 13.37 x 8.91) vs. 6.7ct Diamond (Cabochon, White, 13.47 x 8.98)
- 2.45ct Spinel (Cabochon, Gray, 9.56 x 6.37) vs. 1ct Diamond (Round, White, 6.5 x 6.5)
- 1.6ct Spinel (Cabochon, Red, 8.3 x 5.53) vs. 1.6ct Sapphire (Cabochon, Blue, 8.01 x 5.34)
- 1ct Spinel (Cabochon, Light Red, 7.1 x 4.73) vs. 20ct Emerald (Cabochon, Green, 21.18 x 14.12)
- 5.5ct Spinel (Cabochon, Red, 12.51 x 8.34) vs. 5.5ct Ruby (Cabochon, Red, 12.08 x 8.05)
- 2.08ct Spinel (Cabochon, Gray, 9.05 x 6.03) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 3.9ct Spinel (Cabochon, Red, 11.16 x 7.44) vs. 4ct Diamond (Emerald, White, 10.61 x 7.86)
- 8ct Spinel (Cabochon, Red, 14.18 x 9.45) vs. 8ct Spinel (Oval, Red, 15.68 x 10.45)