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Gem Type Weight Size Clarity Price Origin
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Deep Blue Color-Change Fluorite Gem - 21.3ct Oval Facet (ID: 413809)

Oval Blue Color-Change Fluorite

21.3ct
20.1 x 15.1 mm
$ 425.20
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Light Yellow Green Color-Change Diaspore Gem - 6.7ct Octagon / Scissor Cut (ID: 391064)

Octagon / Emerald Cut Color-Change Diaspore

6.7ct
22.7 x 7.5 mm
$ 2,482.70
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2 pcs
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Very Light Yellow Color-Change Diaspore Gem - 1.5ct Cushion-Cut (ID: 451605)

Cushion Yellow Color-Change Diaspore

1.51 ct (total 3.01ctw)
11 x 4.7 mm
$ 141.47
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Dark Blue Color-Change Fluorite Gem - 21.5ct Oval Facet (ID: 445591)

Oval Blue Color-Change Fluorite

21.5ct
20 x 15.1 mm
$ 538.22
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Egyptian Blue Color-Change Fluorite Gem - 11.4ct Round Facet (ID: 413729)

Round Blue Color-Change Fluorite

11.4ct
14 mm
$ 286.00
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Dark Blue Color-Change Fluorite Gem - 13.4ct Round Facet (ID: 414402)

Round Blue Color-Change Fluorite

13.4ct
15 mm
$ 267.40
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Bright Blue Color-Change Fluorite Gem - 11.5ct Round Facet (ID: 413715)

Round Blue Color-Change Fluorite

11.5ct
14 mm
$ 286.25
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Navy Blue Color-Change Fluorite Gem - 11.2ct Round Facet (ID: 414404)

Round Blue Color-Change Fluorite

11.2ct
14.1 mm
$ 224.20
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Golden Brown Color-Change Garnet Gem - 3.8ct Oval Facet (ID: 344565)

Oval Brown Color-Change Garnet

3.8ct
10.6 x 7.6 mm
$ 490.10
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Very Light Yellow Color-Change Diaspore Gem - 1.2ct Cushion-Cut (ID: 398509)

Cushion Yellow Color-Change Diaspore

1.2ct
9.8 x 4.9 mm
$ 58.49
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Light Yellow Color-Change Diaspore Gem - 3.7ct Octagon / Scissor Cut (ID: 390229)

Octagon / Emerald Cut Color-Change Diaspore

3.7ct
15 x 6.3 mm
$ 912.50
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Very Pale Yellow Color-Change Diaspore Gem - 3.3ct Pear Facet (ID: 390227)

Pear Yellow Color-Change Diaspore

3.3ct
13.1 x 7.6 mm
$ 825.00
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2 pcs
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Very Light Golden-Yellow Color-Change Diaspore Gem - 1.3ct Cushion-Cut (ID: 451601)

Cushion Yellow Color-Change Diaspore

1.31 ct (total 2.61ctw)
10.3 x 4.3 mm
$ 122.67
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Medium Brown Color-Change Garnet Gem - 1.1ct Oval Facet (ID: 344554)

Oval Brown Color-Change Garnet

1.1ct
7.2 x 5.1 mm
$ 99.00
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Light Yellow Color-Change Diaspore Gem - 1.3ct Pear Facet (ID: 548284)

Pear Yellow Color-Change Diaspore

1.3ct
9 x 6.5 mm
$ 68.57
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Pale Yellow Color-Change Diaspore Gem - 1.1ct Oval Facet (ID: 388704)

Oval Yellow Color-Change Diaspore

1.1ct
6.6 x 5.1 mm
$ 52.04
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Light Yellow Color-Change Diaspore Gem - 1.2ct Cushion-Cut (ID: 454099)

Cushion Yellow Color-Change Diaspore

1.2ct
10.8 x 4.5 mm
$ 39.04
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Medium Yellow Color-Change Diaspore Gem - 0.7ct Oval Facet (ID: 389140)

Oval Yellow Color-Change Diaspore

0.7ct
5.6 x 4.7 mm
$ 21.52
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Light Yellow Color-Change Diaspore Gem - 4.1ct Cushion-Cut (ID: 400533)

Cushion Yellow Color-Change Diaspore

4.1ct
19 x 5.4 mm
$ 1,035.00
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Light Yellow Green Color-Change Diaspore Gem - 0.9ct Octagon Facet (ID: 396374)

Octagon / Emerald Cut Color-Change Diaspore

0.9ct
7.4 x 4.2 mm
$ 44.89
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Very Light Yellow Color-Change Diaspore Gem - 0.9ct Octagon Facet (ID: 393861)

Octagon / Emerald Cut Color-Change Diaspore

0.9ct
6.8 x 4.1 mm
$ 35.07
Item in Stock

About Color Change Gemstones

Color-change gemstones in action are an amazing sight. Outside, in normal daylight, they may look green, blue, yellow or whatever color they may be but take them indoors and they will change color to red, orange, purple or any one of a myriad of colors.

There are very few gemstones with this color-change ability. They all have subtle differences in color and some even have the ability to change not only under different sources of light but also at different times of the day!

We have several great examples of color change gemstones including Diaspore, Fluorite, Garnet, Sapphire and most recently, the spectacular Hyalite Opal.

But how does this happen?

Imagine you are looking at a red apple. What we see when we look at an object is reflected light so waves of all colors hit the apple and all the colors are absorbed by the apple except red which reflect back so the apple looks red.

Different light settings can affect what colors we see. A blue gemstone viewed by candle light will look different to one seen in sunlight. Candle light is rich in red wavelengths but poor in blue. Daylight contains more blue and green light and less red light, incandescent light has more red light and less blue and green light.

The special chemical make-up and crystal structure of certain rare gemstones can cause an unusual phenomenon known as color change gemstones.

Certified Customer Reviews
Overall Rating -> 10 star ratings
Loved all my items def will buy again and def will share the company site
Posted By TEDDY in February, 2021
Source: Bizrate
Overall Rating -> 9 star ratings
Love the selection of gems, prices are fair
Posted By Cj in February, 2021
Source: Bizrate
Overall Rating -> 9 star ratings
Gem select has a great selection of Gems, very defined pictures of item and easy process to filter down selection including, gem, color, type, size and weight.
Posted By KingFarm in February, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
A beautiful displayed picture of gemsLike being a kid in a candy store
Posted By Diamond lil in February, 2021
Source: Bizrate
Overall Rating -> 10 star ratings
I had a limited budget and wanted a star ruby. GemSelect offered small, but pretty stones at a very reasonable price. I've always been satisfied with my GemSelect purchases, although there are also eBay vendors I use for less expensive gems. Their selection of more expensive stones, like rubies, is very limited, however.
Posted By Dr S in February, 2021
Source: Bizrate
Overall Rating -> 8 star ratings
I decided recently to start a gemstone collection! I searched online for a reputable gem merchant and found gem select! Their selection is gorgeous and I’m excited to receive my first package! Checkout was a breeze!
Posted By Chris in February, 2021
Source: Bizrate
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All Gemstones (141)
A B C D E F G H I J K L M N O P Q R S T V Z
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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