Login
甲州貴石切子

Koshu precious stone cut glass

Koshu Precious Stone Kiriko was developed by applying cutting techniques such as Edo Kiriko and Satsuma Kiriko. It was born from a collaboration between Yoichi Fukazawa of Jewelry Craft Fukazawa and Yukio Shimizu of Shimizu Precious Stone. Koshu Precious Stone Kiriko is made using a cutting method that is a world first, with Fukazawa in charge of the cut surfaces and Shimizu in charge of the facet surfaces. The stunning cuts, full of originality and like works of art, are combined with the individuality of the gemstones to make them truly one of a kind. There are dozens of patterns in total that combine surface cuts such as rose cuts and checkerboard cuts with several types of cut glass, and it is also possible to enjoy the luxury of collecting and arranging stones with various cuts.

Carats Gem Magazine
" Koushuu precious stone cut glass "

Sort by
[Sale 10 PM on June 5] "Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose-cut, and mint-colored emeralds, normally priced at 88,800 yen (multiple purchase discount available)

[Sale 10 PM on June 5] "Limited 17 Stones" Emerald Gacha 💎 Win Koshu Kiseki Kiriko, rose-cut, and mint-colored emeralds, normally priced at 88,800 yen (multiple purchase discount available) Sale price¥5,980
シトリン 5.121ctルース

[Koshu Precious Stones plusthree] Citrine 5.121ct Loose Sale price¥35,800
【5/22 22時販売】《限定9石》こだわりカットガチャ💎通常39,800円の甲州貴石切子 plusthree「昴：アメトリン」や山本武氏の作品など（おまけでサンジェ氏シトリン1石）《複数購入割引有》

【5/22 22時販売】《限定9石》こだわりカットガチャ💎通常39,800円の甲州貴石切子 plusthree「昴：アメトリン」や山本武氏の作品など（おまけでサンジェ氏シトリン1石）《複数購入割引有》 Sale price¥4,980
[On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available]

[On sale May 29th at 10 PM] "Checker x Sui" Koshu Kiseki Cut Mexican Fire Opal (usually 79,800 yen) Gacha with only 10 stones available. Win a Fire Opal (and receive one Contraluz!). [Multiple purchase discount available] Sale price¥5,980
[On Sale 5/6 10 PM] Limited to 10 Stones: Scapolite Gacha Featuring Koshu Kiseki Kiriko Plusthree "Akatsuki" (Normally ¥45,800) with a Chance to Win! [Multiple Purchase Discount Available]

[On Sale 5/6 10 PM] Limited to 10 Stones: Scapolite Gacha Featuring Koshu Kiseki Kiriko Plusthree "Akatsuki" (Normally ¥45,800) with a Chance to Win! [Multiple Purchase Discount Available] Sale price¥4,980
[Sale on May 4 at 10 PM JST] 12 Limited Pieces: Topaz Gacha (including Imperial Topaz) to win a Koshu Kiseki Kiriko plusthree "Akatsuki" (usually 35,800 yen) - Multiple Purchase Discount Available

[Sale on May 4 at 10 PM JST] 12 Limited Pieces: Topaz Gacha (including Imperial Topaz) to win a Koshu Kiseki Kiriko plusthree "Akatsuki" (usually 35,800 yen) - Multiple Purchase Discount Available Sale price¥4,980
ラベンダークォーツ（スコロライト） 1.761ctルース

[Koshu Precious Stones Plusthree] Lavender Quartz (Scorolite) 1.761ct Loose Stone Sale price¥29,800
《Limited to 11 stones》Koshu Kiseki Kiriko plusthree Peridot (including lilypad) & Monsieur Saint-Jude cut peridot gacha《Multiple purchase discount available》

《Limited to 11 stones》Koshu Kiseki Kiriko plusthree Peridot (including lilypad) & Monsieur Saint-Jude cut peridot gacha《Multiple purchase discount available》 Sale price¥4,980
Limited to 9 stones! Includes Koshu Kiriko plus three citrine gacha, normally priced at 29,800 yen. Discounts available for multiple purchases.

Limited to 9 stones! Includes Koshu Kiriko plus three citrine gacha, normally priced at 29,800 yen. Discounts available for multiple purchases. Sale price¥2,980
Limited Edition Synthetic Moissanite Gacha! 💎 Koshu Kiriko Plus Three Moissanite, Sange Cut, Pink, and Blue Moissanite Loose Stones Available. Multiple Purchase Discounts Available.

Limited Edition Synthetic Moissanite Gacha! 💎 Koshu Kiriko Plus Three Moissanite, Sange Cut, Pink, and Blue Moissanite Loose Stones Available. Multiple Purchase Discounts Available. Sale price¥4,980
Limited to 10 stones: Koshu Precious Stone Kiriko "Broom" plusthree 45ct Dendritic Quartz Gacha (Includes 1 Copper Rutile in Quartz) (Multiple purchase discounts available)

Limited to 10 stones: Koshu Precious Stone Kiriko "Broom" plusthree 45ct Dendritic Quartz Gacha (Includes 1 Copper Rutile in Quartz) (Multiple purchase discounts available) Sale price¥3,980
【甲州貴石切子】特大スモーキークォーツ 108.336ctルース《コラボ》ワッペン付

[Koshu Precious Stone Kiriko] Extra large smoky quartz 108.336ct loose "Collaboration" with emblem Sale price¥128,000
【甲州貴石切子】コロンビア産フローライト 7.240ctルース

[Koshu Precious Stone Kiriko] Fluorite from Colombia 7.240ct loose with emblem Sale price¥29,800
【甲州貴石切子】バイカラーフローライト 6.980ctルース

[Koshu Precious Stone Kiriko] Bicolor Fluorite 6.980ct Loose with Patch Sale price¥59,800
【甲州貴石切子】ストロベリークォーツ 10.023ctルース

[Koshu Precious Stone Kiriko] Strawberry Quartz 10.023ct Loose with Patch Sale price¥69,800
【甲州貴石切子】バイカラーフローライト 19.380ctルース《コラボ》ワッペン付

[Koshu Precious Stone Kiriko] Bicolor Fluorite 19.380ct Loose "Collaboration" with emblem Sale price¥39,800
【甲州貴石切子】スポジュメン 7.390ctルース《コラボ》ワッペン付

[Koshu Precious Stone Kiriko] Spodumene 7.390ct loose "Collaboration" with emblem Sale price¥39,800
【甲州貴石切子】スポジュメン 8.480ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Kiriko] Spodumene 8.480ct《Collaboration》Loose with emblem Sale price¥45,800
【甲州貴石切子】スポジュメン 14.070ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Kiriko] Spodumene 14.070ct《Collaboration》Loose with emblem Sale price¥45,800
【甲州貴石切子plusthree】コロンビア産パイライトインエメラルド 5.076ctルース ワッペン付

[Koshu Precious Stone Kiriko PlusThree] Colombian Pyrite in Emerald 5.076ct Loose with Patch Sale price¥98,000
【甲州貴石切子plusthree】メキシコ産ファイアオパール 1.981ctルース ワッペン付

[Koshu precious stone Kiriko plusthree] Fire opal from Mexico 1.981ct loose with emblem Sale price¥49,800
【甲州貴石切子plusthree】グリーンクォーツ 6mm/0.731ct ルース ワッペン付

[Koshu Precious Stone Kiriko PlusThree] Green Quartz 6mm/0.731ct Loose with Patch Sale price¥18,800
【甲州貴石切子plusthree】グリーンクォーツ 6mm/0.737ctルース ワッペン付

[Koshu precious stone Kiriko plusthree] Green quartz 6mm/0.737ct loose with patch Sale price¥18,800
【甲州貴石切子】スキャポライト 2.01ctルース ワッペン付

[Koshu Precious Stone Cut] Purple Scapolite from Tanzania 2.01ct Loose Patch Sale price¥45,800
【甲州貴石切子】プレーナイト 3.090ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Cutting] Australian Prehnite 3.090ct {Collaboration} Loose Patch Sale price¥39,800
【甲州貴石切子plusthree】ブラジル産アメトリ ン 6.557ctルース ワッペン

[Koshu Precious Stones Plusthree] Brazilian Ametrine 6.557ct Loose Stone Patch Sale price¥55,800
【甲州貴石切子pluethree】イエローベリル 0.880ctルース

[Koshu Precious Stone Cutting Pluethree] Yellow Beryl 0.880ct Loose Sale price¥29,800
【甲州貴石切子plusthree】ロッククリスタル 15mm/10.059ctルース《昴×灯》(ダブル切子タイプ) ワッペン

[Koshu Precious Stone Cut Plusthree] Rock Crystal 15mm/10.059ct Loose Stone "Subaru x Hikaru" (Double Cut Type) Patch Sale price¥45,800
【甲州貴石切子】スコロライト 6.039ctルース ワッペン

[Koshu Precious Stone Cut] Scololite 6.039ct Loose Stone Patch Sale price¥69,800
【甲州貴石切子plusthree】メキシコ産ファイアオパール 4.633ctルース《コラボ》 ワッペン

[Koshu Precious Stones plusthree] Mexican Fire Opal 4.633ct Loose Stone [Collaboration] Patch Sale price¥59,800
【甲州貴石切子plusthree】スイスブルートパーズ 21.690ctルース《コラボ》ワッペン

[Shinjuku Marui withdrawal on 2026/03/19] [Koshu Kiseki Kiriko + Three] Swiss Blue Topaz 21.690ct Loose Gemstone "Collaboration" Patch Sale price¥69,800
【甲州貴石切子plusthree】スカイブルートパーズ 6mm/0.988ctルース ワッペン付

[Koshu Precious Stones Plusthree] Sky Blue Topaz 6mm/0.988ct Loose Stone with Patch Sale price¥25,800
グリーンクォーツ 0.743ctルース

[Koshu Precious Stones plusthree] Green Quartz 6mm/0.743ct Loose with Patch Sale price¥25,800
Sold out 【甲州貴石切子plusthree】モルダバイト 1.511ctルース ワッペン付

[Koshu precious stone Kiriko plusthree] Moldavite 1.511ct loose with patch
Sold out 《Limited to 10 Gems》Koshu Kiseki Kiriko plusthree "Akatsuki" Ametrine Gem Gacha《Bulk Purchase Discount Available》

《Limited to 10 Gems》Koshu Kiseki Kiriko plusthree "Akatsuki" Ametrine Gem Gacha《Bulk Purchase Discount Available》
Sold out 《Limited to 15 Stones》Fluorite Gacha including 2 Koshu-Kiseki-Kiriko stones (normally 49,800 yen) with 1 CC fluorite stone as a bonus《Multiple Purchase Discount Available》

《Limited to 15 Stones》Fluorite Gacha including 2 Koshu-Kiseki-Kiriko stones (normally 49,800 yen) with 1 CC fluorite stone as a bonus《Multiple Purchase Discount Available》
Sold out コロンビア産エメラルド 2.018ctルース

[Koshu precious stone cutter pluethree] Colombian emerald 2.018ct loose
Sold out 《Limited to 20 Stones》Emerald Gacha: Win a 2.2ct Columbia Emerald Koshu-Kiseki Cut (normally 79,800 yen) or an Emerald Cat's Eye! 《Multiple Purchase Discount Available》

《Limited to 20 Stones》Emerald Gacha: Win a 2.2ct Columbia Emerald Koshu-Kiseki Cut (normally 79,800 yen) or an Emerald Cat's Eye! 《Multiple Purchase Discount Available》
Sold out 《Limited to 15 stones》Topaz Gacha with Koshu Kiseki Kiriko 10ct (normally 69,800 yen) and sherry-colored Imperial Topaz included 《Multiple purchase discount available》

《Limited to 15 stones》Topaz Gacha with Koshu Kiseki Kiriko 10ct (normally 69,800 yen) and sherry-colored Imperial Topaz included 《Multiple purchase discount available》

Sold out Limited to 11 stones! Includes Koshu Precious Stone Kiriko plusthree "Irodori," normally priced at 74,800 yen. Sphene Gacha. Multiple purchase discounts available.

Limited to 11 stones! Includes Koshu Precious Stone Kiriko plusthree "Irodori," normally priced at 74,800 yen. Sphene Gacha. Multiple purchase discounts available.
Sold out 《Limited to 13 stones》Normally ¥49,800 Koshu Kiseki Kiriko plusthree "Subaru" lottery💎 Andesine Gacha《Multiple Purchase Discount Available》

《Limited to 13 stones》Normally ¥49,800 Koshu Kiseki Kiriko plusthree "Subaru" lottery💎 Andesine Gacha《Multiple Purchase Discount Available》
Sold out スモーキークォーツ 0.691ctルース

[Koshu precious stone Kiriko plusthree] Smoky quartz 6mm/0.691ct loose with patch
Sold out [Koshu Precious Stones plusthree] Brazilian Garden Quartz 47.809ct Loose

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

Sold out [Koshu Precious Stones plusthree] Spanish Sphalerite 6.417ct Loose Stone

[Koshu Precious Stones plusthree] Spanish Sphalerite 6.417ct Loose Stone

Sold out 《Limited to 15 Stones》Koshu Kiseki Kiriko 《Moon-Cut Kiriko》Blue Topaz Gacha - 1 Loose Stone including 10ct Blue Topaz 《Multiple Purchase Discount Available》

《Limited to 15 Stones》Koshu Kiseki Kiriko 《Moon-Cut Kiriko》Blue Topaz Gacha - 1 Loose Stone including 10ct Blue Topaz 《Multiple Purchase Discount Available》

Sold out 《Limited to 13 stones》Beryl Gacha (including Aquamarine Vortex Cut Koshu Kiseki Kiriko) 1 Loose Stone《Multi-purchase discount available》

《Limited to 13 stones》Beryl Gacha (including Aquamarine Vortex Cut Koshu Kiseki Kiriko) 1 Loose Stone《Multi-purchase discount available》
Sold out 【甲州貴石切子plusthree】パイライトインクォーツ 12.164ctルース ワッペン付

[Koshu precious stone Kiriko plusthree] Pyrite in quartz 12.164ct loose with patch
Sold out 【甲州貴石切子】モルガナイト 14.931ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Kiriko] Morganite 14.931ct《Collaboration》Loose with emblem

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.