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Sold out Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)

Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)
Sold out 【12562825掲載】ミャンマー産マスグラバイト／スピネル 8.005ctルース

8.005ct Loose Myanmar Masgravite/Spinel (Symbiotic Type) with Japan-German Gemmological Institute (GGTL) Certificate

Sold out 【12562824掲載】ミャンマー産マスグラバイト／ターフェアイト 15.472ctルース

Myanmar Musgravite/Taaffeite (symbiotic type) 15.472ct Loose with GIA & ZGCL

Sold out 【12562820掲載】ブラジル産バイカラートルマリン 7.445ctルース

Brazilian bicolor tourmaline 7.445ct loose stone
Sold out ピンクダイヤモンド 0.049ctルース(FANCY PINK, VS-1)

Pink Diamond 2.3mm/0.049ct Loose Stone (FANCY PINK, VS-1) Central Gem Lab

Sold out 【12562706掲載】アメリカ産オレンジベニトアイト 0.135ctルース

0.135 ct. loose American Benitoite (Peach Benitoite), with certificate

Sold out 【12562697掲載】トルマリン 5.620ctルース

[Dandelion Cut] Brazilian Tourmaline 11mm/5.620ct Loose Stone with Certification by Shimizu Kisetsu [Limited to 1 Piece] ¥59,800 Item No. 12562697

Sold out カナダ産ダイヤモンド原石（ソーヤブル） 0.328ct原石（トライゴン有り）

Canadian raw diamond (sawable) 0.328ct raw (with trigons)
Sold out Unheated Pigeon Blood Ruby 0.260ct Loose Stone AIGS

Unheated Pigeon Blood Ruby 0.260ct Loose Stone AIGS
Sold out Bolivian Phosphophyllite 0.193ct Loose Stone with Appraisal

Bolivian Phosphophyllite 0.193ct Loose Stone with Appraisal

Sold out 高知県産血赤珊瑚 6.351ctルース

Kochi Prefecture oxblood coral 6.351ct loose
Sold out 【12561933掲載】ティールグリーンサファイア 2.058ctルース

Teal Green Sapphire 2.058 ct Loose Stone with Appraisal

Sold out [On sale June 7th at 10 PM] Limited to 1 set: 6-stone Benitoite Gradient Set, including Orange Benitoite (Peach Benitoite) (2.25mm, includes top quality) [Multiple Purchase Discount Available]

[On sale June 7th at 10 PM] Limited to 1 set: 6-stone Benitoite Gradient Set, including Orange Benitoite (Peach Benitoite) (2.25mm, includes top quality) [Multiple Purchase Discount Available]
Sold out オーストラリア産シェルオパール（貝オパール） 96.177ct原石

Australian shell opal (shell opal) 96.177ct rough stone
Sold out Bicolor Sphalerite 9.8mm/4.517ct loose

Bicolor Sphalerite 9.8mm/4.517ct loose
Sold out ピンクダイヤモンド 0.073ルース(FANCY DEEP PURPLISH PINK, SI1)

Pink Diamond 0.073 Loose (FANCY DEEP PURPLISH PINK, SI1)
Sold out American Neptunite 0.207ct Loose Stone with Certificate of Authenticity

American Neptunite 0.207ct Loose Stone with Certificate of Authenticity
Sold out American Neptunite 0.290ct Loose Stone with Certificate of Authenticity

American Neptunite 0.290ct Loose Stone with Certificate of Authenticity
Sold out [12548259 published] Padparadscha sapphire 0.524ct loose

[12548259 published] Padparadscha sapphire 0.524ct loose
Sold out Pt950 ベニトアイト 0.17ct リング

Pt950 US Benitote 0.17ct Pink Diamond Ring

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 Silky sapphire from Vietnam, 1.169ct loose stone

Silky sapphire from Vietnam, 1.169ct loose stone

Sold out Colombian emerald 10.940ct rough stone

Colombian emerald 10.940ct rough stone
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 Synthetic Alexandrite 2.046ct Loose

Synthetic Alexandrite 2.046ct Loose
Sold out Pink Diamond 0.139ct Loose (FANCY PURPLISH PINK, I1)

Pink Diamond 0.139ct Loose (FANCY PURPLISH PINK, I1)
Sold out Pt950 Bicolor Sapphire Pendant Top (Necklace Top)

Pt950 Bicolor Sapphire Pendant Top (Necklace Top)

Sold out Cornflower Blue Sapphire 0.370ct Loose AIGS

Cornflower Blue Sapphire 0.370ct Loose AIGS
Sold out Sweet Home Mine Rhodochrosite 0.677ct Loose Gemstone

Sweet Home Mine Rhodochrosite 0.677ct Loose Gemstone
Sold out 0.243ct Colombian Emerald Pair Loose Stones

0.243ct Colombian Emerald Pair Loose Stones
Sold out Grandidierite from Madagascar 0.269ct loose stone

Grandidierite from Madagascar 0.269ct loose stone
Sold out Pigeon blood ruby ​​0.310ct loose

Pigeon blood ruby ​​0.310ct loose
Sold out Pigeon's Blood Ruby 4.0mm/0.230ct Loose AIGS

Pigeon's Blood Ruby 4.0mm/0.230ct Loose AIGS
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 18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring

18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring
Sold out [Koshu Precious Stones plusthree] Brazilian Garden Quartz 47.809ct Loose

[Koshu Precious Stones plusthree] Brazilian Garden Quartz 47.809ct Loose

Sold out 18K Yellow Gold American Peridot 0.339ct Diamond Ring

18K Yellow Gold American Peridot 0.339ct Diamond Ring

Sold out [Sakura In-Cut] Tanzanite from Tanzania 6.0mm/0.774ct Loose Stone

[Sakura In-Cut] Tanzanite from Tanzania 6.0mm/0.774ct Loose Stone
Sold out 18K Yellow Gold Brazilian Paraiba Tourmaline 0.048ct Diamond Pinky Ring (CuO: 1.7%, MnO: 2.2%)

18K Yellow Gold Brazilian Paraiba Tourmaline 0.048ct Diamond Pinky Ring (CuO: 1.7%, MnO: 2.2%)
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 Indian Parrot Chrysoberyl Cat's Eye 5.6mm/1.715ct Loose Stone

Indian Parrot Chrysoberyl Cat's Eye 5.6mm/1.715ct Loose Stone

Sold out Kunzite from Afghanistan 26.784ct loose

Kunzite from Afghanistan 26.784ct loose
Sold out [Sakura In-Cut] Tibetan Andesine 8.0mm/1.366ct Loose Stone

[Sakura In-Cut] Tibetan Andesine 8.0mm/1.366ct Loose Stone

Sold out [Sakura Shape] Oregon Sunstone from the United States, 1.104ct Loose

[Sakura Shape] Oregon Sunstone from the United States, 1.104ct Loose

Sold out [Sakura In-Cut] Mali Garnet (Grossular/Andradite Garnet) from the Republic of Mali, 6.0mm/0.920ct Loose Stone with Certificate of Authenticity

[Sakura In-Cut] Mali Garnet (Grossular/Andradite Garnet) from the Republic of Mali, 6.0mm/0.920ct Loose Stone with Certificate of Authenticity

Sold out Australian Black Opal 0.825 ct Loose Stone

Australian Black Opal 0.825 ct 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.