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Gemtype Color Shape Weight Size Clarity Price Origin
You Selected (11585): Phenomenal Gemstones - Star Sapphire, Andalusite, Kyanite, Rose Quartz, Tanzanite, Rainbow Moonstone, Iolite, Star Ruby, Star Moonstone, Moonstone, Cat's Eye Apatite, Fire Opal, Color Change Garnet, Moss Opal, Opal, Opal Doublet, Aventurine, Cat's Eye Tourmaline, Tiger's Eye, Color Change Sapphire, Star Rose Quartz, Pearl, Cat's Eye Scapolite, Labradorite, Fire Agate, Scapolite, Star Diopside, Cat's Eye Aquamarine, Star Sunstone, Cat's Eye Diaspore, Cat's Eye Chrysoberyl, Star Garnet, Alexandrite, Cat's Eye Quartz, Tiger's Eye Matrix, Cat's Eye Sillimanite, Charoite, Rainbow Pyrite Druzy, Obsidian, Seraphinite, Color-Change Diaspore, Boulder Opal, Ammolite, Pietersite, Chocolate Opal, Black Opal, Cat's Eye Moonstone, Star Lemon Quartz, Hawk's Eye, Actinolite Cat's Eye, Cat's Eye Beryl, Mother of Pearl, Color-Change Fluorite, Opal in Matrix Clear All
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1.7ct Pear Facet Multicolor Opal Gem (ID: 311118)
1.66 ct Opal
12.2 x 9 mm
$ 66.40
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30.7ct Fancy Cabochon Multicolor Fire Agate Gem (ID: 490655)
30.74 ct Fire Agate
28.8 x 19.4 mm
$ 169.07
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27.7ct Fancy Cabochon Multicolor Ammolite Gem (ID: 453598)
27.74 ct Ammolite
29.5 x 19.4 mm
$ 416.10
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1.3ct Trillion Facet Orange Fire Opal Gem (ID: 463200)
1.34 ct Fire Opal
9.3 x 7.7 mm
$ 43.46
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1.2ct Octagon Step Cut Green to Pink Color-Change Diaspore Gem (ID: 395415)
1.23 ct Color-Change Diaspore
7.6 x 5.2 mm
$ 58.66
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1.6ct Oval Facet Violet Blue Tanzanite Gem (ID: 423682)
1.57 ct Tanzanite
8.2 x 6.5 mm
$ 181.30
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20 pcs
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0.4ct Square with Hole Gray Blue Sheen Labradorite Gem (ID: 479131)
0.40 ct (total 7.92ctw) Labradorite
4.9 x 4.8 mm
$ 8.40
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123.4ct Oval Cabochon Gold Sheen Black Obsidian Gem (ID: 447905)
123.42 ct Obsidian
65.1 x 33.1 mm
$ 123.42
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2 pcs
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1.7ct Carved Flower Mocha Moonstone Gem (ID: 485142)
1.70 ct (total 3.40ctw) Moonstone
10 x 9.5 mm
$ 13.60
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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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2 pcs
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0.8ct Oval Facet Orange Fire Opal Gem (ID: 432452)
0.84 ct (total 1.68ctw) Fire Opal
8 x 6.2 mm
$ 44.67
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2 pcs
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1ct Trillion Facet Violet Blue Tanzanite Gem (ID: 421183)
0.95 ct (total 1.89ctw) Tanzanite
6.6 x 6.5 mm
$ 219.60
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2 pcs
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4.1ct Asscher Cut Pink Rose Quartz Gem (ID: 394438)
4.07 ct (total 8.14ctw) Rose Quartz
9.6 x 9.5 mm
$ 40.70
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20 pcs
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0.1ct Square Facet Blue White Rainbow Moonstone Gem (ID: 315107)
0.14 ct (total 2.89ctw) Rainbow Moonstone
3 x 3 mm
$ 49.13
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18.3ct Oval Cabochon Multicolor Opal Gem (ID: 467270)
18.33 ct Opal
20 x 16.9 mm
$ 737.97
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4 pcs
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1.3ct Carved Flower Peach-Pink Moonstone Gem (ID: 485291)
1.30 ct (total 5.18ctw) Moonstone
8.4 x 8.4 mm
$ 20.72
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4 pcs
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3.9ct Briolette with Hole Pink Rose Quartz Gem (ID: 484586)
3.94 ct (total 15.77ctw) Rose Quartz
11.9 x 7.8 mm
$ 31.54
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544.4ct Carved Owl Gray Blue Sheen Labradorite Gem (ID: 470550)
544.43 ct Labradorite
55.7 x 69.1 mm
$ 337.55
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6 pcs
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0.3ct Marquise Facet Bluish Violet Tanzanite Gem (ID: 258887)
0.33 ct (total 1.99ctw) Tanzanite
7 x 3.4 mm
$ 71.64
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6 pcs
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0.2ct Round Facet Multicolor Andalusite Gem (ID: 390478)
0.20 ct (total 1.17ctw) Andalusite
3.6 mm
$ 57.05
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20 pcs
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0.2ct Square Facet White Blue Rainbow Moonstone Gem (ID: 297884)
0.17 ct (total 3.37ctw) Rainbow Moonstone
3.1 x 3 mm
$ 87.62
Item in Stock
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Phenomenal Gemstones
Phenomenal gemstones are extremely rare and highly prized; truly one of nature's most impressive creations. Gemstone optical phenomena is a result which varies, due to the way light either interacts or interferes with the structural anatomy of any given gemstone. Light interaction or interference can be seen in the form of reflection, refraction, diffraction, scattering, absorption and transmission. There are many different forms of gemstone phenomena, while some effects are quite common, simple and subtle; some are absolutely astounding and dramatic.

Phenomenal gems make excellent gifts for both novice and veteran gem collectors. Most would expect such exotic gemstones to come with a hefty price tag, but many phenomenal gems are surprisingly very affordable. Some examples of gemstone phenomena and popular gem types known to exhibit phenomenal qualities include adularescence, aventurescence, chatoyancy, asterism, iridescence, labradorescence, color change, play of color, pleochroism, fluorescence and tenebrescence.

Certified Customer Reviews
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I have purchased from Gemselect before, the shopping is easy, clear and quick. You have a wide range of products so I can adjust what I want to how much I can spend! The photos of the gems are beautiful and make it easy to choose the one suits me best! I honestly cannot fault you in any way at all! The delivery is always timely too! You guys rock! ;)
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Posted By Paddy whack in September, 2018
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Easy to use and informative website. There was more than ample information provided about the gemstones and the process.
Posted By Kathy in September, 2018
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Overall Rating -> 8 star ratings
This site is super easy to use and has fair prices and plenty of great products!
Posted By Willkayak 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

Size Comparison Chart