Topaz (18.30 Carat )
![](../images/shapes/size410/round_selected.png)
16.42 x 16.42 mm
Stone Type : | Topaz |
Stone Shape : | Round |
Stone Weight : | 18.30 carat |
Length X Width : | 16.42 x 16.42 mm |
Length / Width Ratio : | 1.00 |
Approx Face-up Area : | 211.71 mm² |
Approx Volume : | 1,036.84 mm³ |
How many Colors Available for Topaz ?
White , Light Red , Red , Dark Red , Orangey Red , Light Orange , Orange , Light Brown , Brown , Dark Brown , Light Yellow , Yellow , Light Yellowish Green , Yellowish Green , Dark Yellowish Green , Light Green , Green , Dark Green , Light Bluish Green , Bluish Green , Dark Bluish Green , Light Blue , Blue , Dark Blue , Light Violet , Violet , Dark Violet , Light Purple , Purple , Dark Purple , Light Grey , Grey ,
![White](../images/colors/round___white.png)
![Light Red](../images/colors/round___light_red.png)
![Red](../images/colors/round___red.png)
![Dark Red](../images/colors/round___dark_red.png)
![Orangey Red](../images/colors/round___orangey_red.png)
![Light Orange](../images/colors/round___light_orange.png)
![Orange](../images/colors/round___orange.png)
![Light Brown](../images/colors/round___light_brown.png)
![Brown](../images/colors/round___brown.png)
![Dark Brown](../images/colors/round___dark_brown.png)
![Light Yellow](../images/colors/round___light_yellow.png)
![Yellow](../images/colors/round___yellow.png)
![Light Yellowish Green](../images/colors/round___light_yellowish_green.png)
![Yellowish Green](../images/colors/round___yellowish_green.png)
![Dark Yellowish Green](../images/colors/round___dark_yellowish_green.png)
![Light Green](../images/colors/round___light_green.png)
![Green](../images/colors/round___green.png)
![Dark Green](../images/colors/round___dark_green.png)
![Light Bluish Green](../images/colors/round___light_bluish_green.png)
![Bluish Green](../images/colors/round___bluish_green.png)
![Dark Bluish Green](../images/colors/round___dark_bluish_green.png)
![Light Blue](../images/colors/round___light_blue.png)
![Blue](../images/colors/round___blue.png)
![Dark Blue](../images/colors/round___dark_blue.png)
![Light Violet](../images/colors/round___light_violet.png)
![Violet](../images/colors/round___violet.png)
![Dark Violet](../images/colors/round___dark_violet.png)
![Light Purple](../images/colors/round___light_purple.png)
![Purple](../images/colors/round___purple.png)
![Dark Purple](../images/colors/round___dark_purple.png)
![Light Grey](../images/colors/round___light_grey.png)
![Grey](../images/colors/round___grey.png)
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.
Name of Stone : | Topaz |
Mineral : | Topaz |
Shape : | Round |
Chemical Formula : | Al2SiO4(F,OH)2 |
Crystal Structure : | Orthorhombic |
Hardness : | 8 |
Specific Gravity : | 3.53 |
Carat weight : | 18.30 carat |
Gram weight : | 3.660 gm |
Ounces weight : | 0.1291 ounces |
Length : | 16.42 mm |
Width : | 16.42 mm |
Length / Width Ratio : | 1.00 |
Average diameter : | 16.42 mm |
Approx Face-up Area : | 211.71 mm² |
Approx Volume : | 1,036.84 mm³ |
Refractive Index : | 1.610 - 1.638 |
Cleavage : | 1,3 - basal |
Luster : | Vitreous |
Birefringence : | 0.014 |
Wearability : | Very good |
Birthstone : | Topaz is a birthstone for the month of December |
Before purchasing a diamond, one should make sure it looks its weight. It's important to understand that carat weight does not equal face-up size.
Two diamonds of exactly the same weight (and shape) can vary quite considerably in face-up size. This depends on the proportions of the cut (e.g., deep cuts will face up smaller)..
Face-up area is a measure of the size of the diamond when viewed from the top view.
It tells you how big the diamond is at the girdle plane. It's important for a diamond to have sufficient face-up size for its carat weight
Diamond prices vary greatly as they depend on the combination of unique characteristics (4Cs - Cut, Color, Clarity, and Carat). For best value, it's important to choose the combination that will reduce the price without having a negative impact on appearance.
You also need to consider some of the following points as well
- Strong blue fluorescence.
- Fair or Poor symmetry.
- Extremely thin or extremely thick girdle.
- Inclusions visible to the naked eye.
- Diamond Certification.
Blue fluorescence can have a positive, negative, or zero effect on a diamond. Diamonds in the lower color range (H or lower) can benefit from it, as it can make them look whiter, more colorless. On the other hand, strong fluorescence can cause a stone (especially in the higher color range D-G) to appear hazy or milky under certain light conditions. One of the biggest benefits of fluorescent diamonds is that they generally cost less.
Blue fluorescence can be found in 35% of naturally mined diamonds and it makes the stone glow under UV light. Outside of UV lighting environments, there are no visual differences between fluorescent and non-fluorescent diamonds.
However, there exists a big difference in pricing between these diamonds. In the industry, diamonds with fluorescence are usually traded at a 10-15% discount and can go as high as 25% for higher colored diamonds.
GIA grades fluorescence as None, Faint, Medium, Strong, and Very Strong.
There are Many Laboratory Available which provides certification for Gemstones.
- GIA - Gemological Institute of America
- AGS - American Gemological Society
- HRD - The Hoge Raad voor Diamant
- IGI - International Gemological Institute
- EGL - European Gemological Laboratories
- GSI - Gemological Science International
*Different certification labs give different results
Piecut Diamonds are set of small Diamonds, which are cut & polished with Precised Measurements to look like a Single Solitaire diamond which can save 80% to 85% from Solitaire Single Piece Price.
Shapes of Pie Cut Diamonds.
- 9 Pcs Emerald
- 9 Pcs Round
- 4 Pcs Round
- 3 Pcs Heart
- 4 Pcs Oval
- 4 Pcs Pear
- 4 Pcs Marquise
- 5 Pcs Star
Click here for More Information
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