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blue/blue gemstones

There are many gemstones that have blue or blue hues. Typical examples include sapphire, aquamarine, tanzanite, Paraiba tourmaline, blue topaz, iolite, lapis lazuli, and turquoise, but there are others as well. Even though it's a blue color, there are some that are more greenish and others that are more purple, and the impression changes depending on the shade and transparency, and the more you know about it, the more you want to collect it.

Karatz GemMagazine
" 10 Blue Gems "

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Sold out 0.092ct loose stone with iolite and phlogopite (phlogopite)

0.092ct loose stone with iolite and phlogopite (phlogopite)

Sold out Tanzanian Kornerupine (with Goethite) 2.6mm/0.068ct Loose

Tanzanian Kornerupine (with Goethite) 2.6mm/0.068ct Loose

Sold out [Yukinko Cut] Synthetic Sapphire 2.102ct Loose Stone

[Yukinko Cut] Synthetic Sapphire 2.102ct Loose Stone

Sold out [Yukinko Cut] Siberian Blue Quartz (Synthetic Quartz) 0.999ct Loose Stone

[Yukinko Cut] Siberian Blue Quartz (Synthetic Quartz) 0.999ct Loose Stone

Sold out [Yukinko Cut] Siberian Blue Quartz (Synthetic Quartz) 2.420ct Loose Stone

[Yukinko Cut] Siberian Blue Quartz (Synthetic Quartz) 2.420ct Loose Stone

Sold out 【Yukinko Cut】 Siberian Blue Quartz (Synthetic Quartz) 2.503ct Loose

【Yukinko Cut】 Siberian Blue Quartz (Synthetic Quartz) 2.503ct Loose

Sold out Sri Lankan Cobalt Spinel (Blue Spinel) 3.202ct Loose Stone (Needle-like Inclusions) Japan-German Rare Stone

Sri Lankan Cobalt Spinel (Blue Spinel) 3.202ct Loose Stone (Needle-like Inclusions) Japan-German Rare Stone

Sold out 0.076ct Loose Madagascar Bekily Blue Garnet (Color Change Garnet)

0.076ct Loose Madagascar Bekily Blue Garnet (Color Change Garnet)
Sold out Synthetic Alexandrite 2.046ct Loose

Synthetic Alexandrite 2.046ct Loose
Sold out Tanzanite from Tanzania 4.5mm/0.390ct Loose Stone AIGS

Tanzanite from Tanzania 4.5mm/0.390ct Loose Stone AIGS
Sold out Cornflower Blue Sapphire 0.370ct Loose AIGS

Cornflower Blue Sapphire 0.370ct Loose AIGS
Sold out 0.336 ct Tanzanian Kornerupine Loose Gemstone

0.336 ct Tanzanian Kornerupine Loose Gemstone
Sold out Grandidierite from Madagascar 0.269ct loose stone

Grandidierite from Madagascar 0.269ct loose stone
Sold out Tanzanite from Tanzania 0.417ct Loose Gemstone

Tanzanite from Tanzania 0.417ct Loose Gemstone
Sold out Brazilian Dumortierite in Quartz 1.516ct Loose Gemstone

Brazilian Dumortierite in Quartz 1.516ct Loose Gemstone
Sold out Afghanistan Lapis Lazuli 11mm/5.263ct Loose Stone

Afghanistan Lapis Lazuli 11mm/5.263ct Loose Stone
Sold out 0.278 ct loose Nigerian cobalt gahnite with Japanese and German appraisals

0.278 ct loose Nigerian cobalt gahnite with Japanese and German appraisals
Sold out Golden Hill Turquoise from Kazakhstan, 2.524ct Loose Stone

Golden Hill Turquoise from Kazakhstan, 2.524ct Loose Stone
Sold out Golden Hill Turquoise from Kazakhstan, 2.882ct loose stone

Golden Hill Turquoise from Kazakhstan, 2.882ct loose stone
Sold out Golden Hill Turquoise from Kazakhstan, 2.235ct loose stone

Golden Hill Turquoise from Kazakhstan, 2.235ct loose stone
Sold out Cambodian Blue Zircon (Ratanakiri Blue) 0.537ct Loose

Cambodian Blue Zircon (Ratanakiri Blue) 0.537ct Loose
Sold out Sri Lanka Blue Sapphire 5.0mm/0.552ct Loose Stone

Sri Lanka Blue Sapphire 5.0mm/0.552ct Loose Stone

Sold out Loose Brazilian Medusa Quartz (Paraiba Quartz) 0.748ct

Loose Brazilian Medusa Quartz (Paraiba Quartz) 0.748ct
Sold out Brazilian Dumortierite in Quartz 1.736ct Loose

Brazilian Dumortierite in Quartz 1.736ct Loose
Sold out Unheated Blue Sapphire from Madagascar, 1.380ct Loose, AIGS

Unheated Blue Sapphire from Madagascar, 1.380ct Loose, AIGS

Sold out Brazilian Indicolite Tourmaline 0.342ct Loose

Brazilian Indicolite Tourmaline 0.342ct Loose

Sold out Tanzanite from Tanzania 0.730ct loose stone

Tanzanite from Tanzania 0.730ct loose stone

Sold out Brazilian Santa Maria Aquamarine 0.524ct Loose Stone

Brazilian Santa Maria Aquamarine 0.524ct Loose Stone

Sold out 0.321ct Blue Sapphire Loose Gemstone from Sri Lanka

0.321ct Blue Sapphire Loose Gemstone from Sri Lanka
Sold out Cornflower Blue Sapphire 0.680ct Loose AIGS

Cornflower Blue Sapphire 0.680ct Loose AIGS
Sold out 【12560350掲載】ジンバブエ産ユークレース 0.138ctルース

Zimbabwean Euclase 0.138ct Loose Stone
Sold out Unheated Brazilian Bicolor Topaz (Bicolor Blue Topaz) 2.884ct Loose Gemstone

Unheated Brazilian Bicolor Topaz (Bicolor Blue Topaz) 2.884ct Loose Gemstone
Sold out 【12560359掲載】ジンバブエ産バイカラーユークレース 0.654ctルース

Zimbabwean Bicolor Euclase 0.654ct Loose Stone
Sold out Tanzanian Violet Sapphire 0.920ct Loose

Tanzanian Violet Sapphire 0.920ct Loose
Sold out Tanzanian Kornerupine 0.103ct Loose Stone

Tanzanian Kornerupine 0.103ct Loose Stone
Sold out Cambodian Blue Zircon (Ratanakiri Blue) 0.674ct Loose Stone

Cambodian Blue Zircon (Ratanakiri Blue) 0.674ct Loose Stone
Sold out Afghanistan Blue Tourmaline 4.0mm/0.268ct Loose Stone (Lagoon Tourmaline)

Afghanistan Blue Tourmaline 4.0mm/0.268ct Loose Stone (Lagoon Tourmaline)
Sold out Cornflower Blue Sapphire 4.5mm/0.430ct Loose Stone AIGS

Cornflower Blue Sapphire 4.5mm/0.430ct Loose Stone AIGS
Sold out 【12560374掲載】ブルートパーズキャッツアイ 22.761ctルース

Brazilian Blue Topaz Cat's Eye 15mm/22.761ct Loose Stone
Sold out Grandidierite from Madagascar 0.167ct loose stone

Grandidierite from Madagascar 0.167ct loose stone
Sold out Grandidierite from Madagascar 0.169ct loose stone

Grandidierite from Madagascar 0.169ct loose stone
Sold out Zimbabwean Euclase 2.2mm/0.065ct Loose Stone

Zimbabwean Euclase 2.2mm/0.065ct Loose Stone
Sold out 0.848ct Loose Brazilian Medusa Quartz (Paraiba Quartz)

0.848ct Loose Brazilian Medusa Quartz (Paraiba Quartz)
Sold out Royal Blue Sapphire 1.00ct Loose AIGS

Royal Blue Sapphire 1.00ct Loose AIGS

Sold out 0.361ct loose Brazilian Paraiba Tourmaline (CuO:1.0%, MnO:3.6%)

0.361ct loose Brazilian Paraiba Tourmaline (CuO:1.0%, MnO:3.6%)
Sold out Brazilian Paraiba tourmaline 0.128ct loose stone (CuO: 1.7%, MnO: 3.4%)

Brazilian Paraiba tourmaline 0.128ct loose stone (CuO: 1.7%, MnO: 3.4%)

Sold out German Auchenite 0.083ct loose stone

German Auchenite 0.083ct loose stone

KARATZ Custom Made

Why not take your favorite gemstone that you found at KARATZ and have it made into custom-made jewelry? It will be made by skilled Japanese craftsmen.
We carefully craft each piece of jewelry, starting with the stone setting, to match the individual characteristics of the gemstone.

KARATZ・Five Commitments

So that more people can feel closer to jewellery and enjoy it easily.
We will introduce KARATZ's thoughts on products, the attention to detail and efforts in selecting gemstones and creating jewelry.

KARATZ's Initiatives and Social Contributions

We will introduce KARATZ's efforts, including nurturing the next generation and business collaboration to develop the industry, and supporting children in Sri Lanka, the land of jewels.

KARATZ Books

These are books that KARATZ has been involved in writing, supervising, and planning. They are all books that allow you to enjoy gemstones from various angles. You can also purchase them directly.

jeweler's tools

For those who want to enjoy jewelry more but don't know what tools to use, we will introduce tools that are also used by KARATZ staff. You can also purchase them directly.