20 Carat Topaz (Emerald, 18.08×13.39mm, Blue)
Color:
Actual size is set for screen
How big is a 20 carat emerald-cut Topaz?
It depends on the cut parameters and length-to-width ratio, but a typical size of a 20ct emerald-cut Topaz would be around 18.08×13.39 mm (±6%). The lw ratio of this Topaz is 1.35. 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 |
80 % |
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Saved...
|
|
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Ring diameter:
16.9 mm
|
Additional Info
Topaz is a gemstone of many colors. It’s commonly found colorless (white) and then treated to achieve desired colors. Blue Topaz is the most common and popular color variety.
Where to buy?
For certified gemstones, high-end gemstone jewelry, and birthstone jewelry, see Blue Nile
Gem Details
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Name:
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Topaz |
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Shape:
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Emerald |
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Chemical Formula:
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Al2SiO4(F,OH)2 |
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Crystal Structure:
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Orthorhombic |
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Hardness:
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8 |
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Specific Gravity
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3.53 |
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Carat weight:
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20 ct |
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Gram weight:
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4 g (0.1411 ounces) |
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Points:
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2000 pts |
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Length:
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18.08 mm |
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Width:
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13.39 mm |
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Est. face-up size:
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225.14 mm² |
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Volume:
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1133.14 mm³ |
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Length-to-width ratio:
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1.35 |
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Refractive Index:
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1.610 - 1.638 |
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Luster:
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Vitreous |
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Wearability:
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Very good |
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Care Instructions:
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Avoid hard hits or drops |
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Color:
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Topaz can be found in the following colors:
                              
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Birthstone:
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Topaz is a birthstone for the month of December |
Popular comparisons:
- 20ct Topaz (Emerald, Blue, 18.08 x 13.39) vs. 0.13ct Aquamarine (Round, Light Blue, 3.45 x 3.45)
- 20ct Topaz (Emerald, Blue, 18.08 x 13.39) vs. 14.9ct Topaz (Emerald, Blue, 16.38 x 12.13)
- 20ct Topaz (Emerald, Blue, 18.08 x 13.39) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 10ct Topaz (Emerald, White, 14 x 11) vs. 1ct Emerald (Emerald, Green, 7.28 x 5.39)
- 0.5ct Topaz (Emerald, Blue, 5.28 x 3.91) vs. 0.6ct Topaz (Emerald, Blue, 5.62 x 4.16)
- 11ct Topaz (Emerald, Blue, 14.81 x 10.97) vs. 11ct Diamond (Emerald, White, 14.86 x 11.01)
- 2ct Topaz (Emerald, Dark Bluish Green, 9 x 7) vs. 3ct Topaz (Emerald, Blue, 10 x 8)
- 10ct Topaz (Emerald, Blue, 14.34 x 10.62) vs. 23ct Kunzite (Cushion, Light Purple, 17.17 x 17.17)