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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (1644): Trillion Shaped Gems Clear All
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2.9ct Trillion Facet Swiss Blue Topaz Gem (ID: 414239)
2.85 ct Topaz
9.1 x 8.8 mm
$ 19.95
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6.1ct Trillion Cabochon Multicolor Ammolite Gem (ID: 284804)
6.14 ct Ammolite
16.2 x 14.7 mm
$ 61.40
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10 pcs
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0.5ct Trillion Facet Pinkish Rose Rhodolite Garnet Gem (ID: 423772)
0.52 ct (total 5.15ctw) Rhodolite Garnet
5.1 x 5.1 mm
$ 41.20
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0.9ct Trillion Facet Pinkish Red Spinel Gem (ID: 503515)
0.87 ct Spinel
10.3 x 6 mm
$ 243.60
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0.4ct Trillion Facet Light Pink Morganite Gem (ID: 478821)
0.36 ct Morganite
5 x 4.9 mm
$ 19.80
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1.2ct Trillion Facet Violet Blue Tanzanite Gem (ID: 280431)
1.19 ct Tanzanite
7.2 x 7.3 mm
$ 187.43
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4 pcs
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0.5ct Trillion Facet Swiss Blue Topaz Gem (ID: 429728)
0.51 ct (total 2.04ctw) Topaz
5.3 x 5.1 mm
$ 10.20
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2 pcs
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1.1ct Trillion Facet Violet Blue Tanzanite Gem (ID: 421219)
1.08 ct (total 2.16ctw) Tanzanite
7.3 x 7.1 mm
$ 250.97
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3.7ct Trillion Facet Swiss Blue Topaz Gem (ID: 417505)
3.73 ct Topaz
10 x 9.9 mm
$ 26.11
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10 pcs
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0.3ct Trillion Facet Red Pyrope Garnet Gem (ID: 479344)
0.28 ct (total 2.82ctw) Pyrope Garnet
3.9 x 3.9 mm
$ 19.74
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2 pcs
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3ct Trillion Cabochon Green Seraphinite Gem (ID: 502860)
3.03 ct (total 6.06ctw) Seraphinite
12.7 x 12.2 mm
$ 3.03
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2 pcs
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1ct Trillion Facet Violet Blue Tanzanite Gem (ID: 421169)
0.98 ct (total 1.96ctw) Tanzanite
7.1 x 7 mm
$ 227.73
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7.5ct Trillion Facet Violet Blue Tanzanite Gem (ID: 384341)
7.47 ct Tanzanite
11.3 x 11.3 mm
$ 3,780.79
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4.2ct Trillion Facet Olive Green Idocrase Gem (ID: 503093)
4.20 ct Idocrase
10.7 x 10.5 mm
$ 430.29
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5 pcs
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0.5ct Trillion Facet Pinkish Rose Rhodolite Garnet Gem (ID: 432351)
0.50 ct (total 2.50ctw) Rhodolite Garnet
5.2 x 5.2 mm
$ 20.00
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1.2ct Trillion Facet Sky Blue Topaz Gem (ID: 452895)
1.24 ct Topaz
7.2 x 7.1 mm
$ 8.68
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2 pcs
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1.3ct Trillion Facet Swiss Blue Topaz Gem (ID: 445705)
1.27 ct (total 2.54ctw) Topaz
7.2 x 7.2 mm
$ 16.59
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5.2ct Trillion Facet Olive Green Idocrase Gem (ID: 503094)
5.16 ct Idocrase
11.3 x 11.2 mm
$ 528.64
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34.2ct Trillion Cabochon Violet Sugilite Gem (ID: 474566)
34.24 ct Sugilite
29.7 x 23.9 mm
$ 68.48
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5.7ct Fancy Carved Trillion Lemon Quartz Gem (ID: 500192)
5.68 ct Quartz
11.9 x 11.4 mm
$ 17.04
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1.1ct Trillion Facet Violet Blue Tanzanite Gem (ID: 424277)
1.05 ct Tanzanite
7.2 x 7 mm
$ 121.54
Item in Stock
Trillion Shaped Gems
When it comes to gemstones, shape and cut are are often used interchangeably. The reason is because the difference between the two isn't always obvious. Shape refers to the overall outline of a stone, while 'cut' refers the actual style, process or technique used to work the rough into finished gemstone pieces. Historically, a trilliant gem exhibits the basic trilliant design, featuring 43 facets cut into a triangular shape gemstone that has been worked into 1:1 ratio and cut with 43 facets. The 43 facets are based on the 'brilliant-cut' in order to maximize 'brilliance'. Like other brilliant cuts, the equilateral form of a well-cut trilliant gem should return a substantial degree of light and color to the eye. The trillion cutting style was originally introduced by the Asscher brothers (Asscher-cut) and was trademarked in 1962 by Henry Meyer Diamond Company of New York. Since the expiration of their 'trillion' patent, the term can be used to refer to all triangular shaped gems, even those which are not faceted.

Many trillions today are step-cut, scissor-cut, plain-cut, mixed-cut with undulating surfaces, and trillion gemstones are even cut en cabochon, featuring a flat bottom with a low or high dome depending on the type of gem. As long as the gemstone has a face-up outline or shape which resembles a triangle, then it can be described as a trillion-shaped gemstone. Gemstones like zircon, spinel, diamond, aquamarine, beryl and white sapphire are often cut as trillions to maximize brilliance, while darker gemstones such as tanzanite, spessartite garnet, rhodolite garnet and amethyst are given a trilliant cut in order to lighten and brighten color (rather than focusing on brilliance). Since most diamond-cut styles are modified for colored stones, many colored stone dealers use alternative terms that refer to shape rather than cut-style.
Certified Customer Reviews
Overall Rating -> 10 star ratings
Satisfied with gem & purchase process! Thanks!
Posted By in October, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
Easy to see the gemstones you are buying, easy to see prices and shipping.
Posted By Amy in October, 2018
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Overall Rating -> 10 star ratings
I have been using GemSelect for at lest five years and I have no complaints!
Posted By in October, 2018
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Overall Rating -> 10 star ratings
This site always has beautiful stones to choose from and you will get the actual gem that is pictured. The shipping is fast and reasonably priced.
Posted By CAC in October, 2018
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Overall Rating -> 10 star ratings
I have not gotten my gems, but when i do i will be very happy, yet i did not like you had to pay $15 extra for faster shipping
Posted By Jack in October, 2018
Source: Bizrate
Overall Rating -> 10 star ratings
I love GemSelect, personally. I browse their site almost daily to see all the new stones available. Their selection is pretty amazing. The quality isn't always the highest and the cut of the stones isn't always perfect. But for the price, and if you look hard enough, you can find a real gem, so to speak.
Posted By Patrick in September, 2018
Source: Bizrate
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Size and Weight

Gems are always measured in Millimeter (mm)

Dimensions are given as;
length x width x depth,
except for round stones which are;
diameter x depth

Select gems by size, not by weight!
Gem varieties vary in density, so carat weight is not a good indication of size

Note: 1ct = 0.2g

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