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 "

Sold out

[Koshu Precious Stone Kiriko] Dumortierite in Quartz 10.068ct loose with emblem

Sold out

[Koshu Precious Stones Plusthree] Sky Blue Topaz 4.415ct Loose

Sold out

[Koshu precious stone Kiriko plusthree] Particolor tourmaline 3.544ct loose

Sold out

【甲州貴石切子plusthree】ロッククリスタル 15.588ct《切子玉》ルースワッペン付

[Koshu Precious Stone Kiriko PlusThree] Rock Crystal 15.588ct《Kirikodama》 Loose with Patch

Sold out

【甲州貴石切子】メキシコ産ファイアオパール 1.318ct《コラボ》ルースワッペン付

[Koshu Precious Stone Kiriko] Fire Opal from Mexico 1.318ct《Collaboration》 Loose with emblem

Sold out

【甲州貴石切子】メキシコ産ファイアオパール 1.586ct《コラボ》ルースワッペン付

[Koshu Precious Stone Kiriko] Fire Opal from Mexico 1.586ct《Collaboration》 Loose with emblem

Sold out

【甲州貴石切子】《月型切子》アメトリン 12.681ct《コラボ》ルースワッペン付

[Koshu Precious Stone Kiriko]《Moon-shaped Kiriko》Ametrine 12.681ct《Collaboration》Loose Patch

Sold out

【甲州貴石切子plusthree】デンドリティッククォーツ 17.110ctルースワッペン付

[Koshu precious stone Kiriko plusthree] Dendritic quartz 17.110ct loose with patch

Sold out

[Koshu Precious Stone Kiriko] Bicolor Amethyst 14.320ct Loose with Patch

Sold out

[Koshu Precious Stone Kiriko] Blue Topaz 27.540ct Loose with Patch

Sold out

【甲州貴石切子】イエロースキャポライト（UVタイプ） 4.880ctルースワッペン付

[Koshu Precious Stone Kiriko] Yellow Scapolite (UV type) 4.880ct loose with patch

Sold out

[Koshu Precious Stone Kiriko] Purple Scapolite 5.450ct Loose with Patch

Sold out

【甲州貴石切子】アンデシン・ラブラドライト（通称名ブルームーンストーン） 1.970ctルースワッペン付

[Koshu Precious Stone Kiriko] Andesine Labradorite (commonly known as Blue Moonstone) 1.970ct loose with emblem

Sold out

【甲州貴石切子plusthree】コロンビア産エメラルド 4.523ctルース《コラボ》ワッペン付

[Koshu precious stone Kiriko plusthree] Colombian emerald 4.523ct loose "Collaboration" with emblem

Sold out

【甲州貴石切子plusthree】コロンビア産エメラルド 2.729ctルース《コラボ》ワッペン付

[Koshu precious stone Kiriko plusthree] Colombian emerald 2.729ct loose "Collaboration" with emblem

Sold out

[Koshu Precious Stone Kiriko] Iolite 2.910ct《Collaboration》 Loose with emblem

Sold out

【甲州貴石切子】アンデシン・ラブラドライト（通称名レインボームーンストーン） 2.760ctルース《6月誕生石》

[Koshu Precious Stone Kiriko] Andesine Labradorite (commonly known as Rainbow Moonstone) 2.760ct Ruth《June Birthstone》

Sold out

[Koshu Precious Stone Kiriko] Tanzanite 2.360ct loose with patch

Sold out

[Koshu Precious Stone Kiriko] Rock Crystal 3.560ct Loose with Patch

Sold out

[Koshu Precious Stone Kiriko] Fire Opal 2.810ct《Collaboration》 Loose with emblem

Sold out

[Koshu Precious Stone Kiriko] Opal 1.20ct loose

Sold out

[Koshu Precious Stone Kiriko] Andesine 0.980ct loose

Sold out

[Koshu Precious Stone Kiriko] Oregon Sunstone 2.330ct Loose with Patch

Sold out

[Koshu Precious Stone Kiriko] Dumortierite 4.275ct loose

Sold out

【甲州貴石切子】アンデシン・ラブラドライト（通称名レインボームーンストーン） 0.876ctルース

[Koshu Precious Stone Kiriko plusthree] Andesine Labradorite (commonly known as Rainbow Moonstone) 0.876ct loose

Sold out

【甲州貴石切子】アイオライトサンストーン 1.510ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Iolite Sunstone 1.510ct Loose

Sold out

[Koshu precious stone cut] Opal 0.760ct loose

Sold out

[Koshu Precious Stone Kiriko] Moonstone 3.400ct loose

Sold out

【甲州貴石切子】K18グリーンクォーツ4.592ct ペンダント（2wayタイプ） - カラッツSTORE

[Koshu Precious Stone Kiriko] K18 Green Quartz 4.592ct Pendant (2way type) with patch

Sold out

【甲州貴石切子】フローライトインクォーツ 4.550ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Fluorite in Quartz 4.550ct Loose

Sold out

[Koshu Precious Stone Kiriko] Ametrine 3.400ct loose

Sold out

[Koshu Precious Stone Kiriko] Tanzanite 1.740ct loose

Sold out

【甲州貴石切子】アルマンディンガーネット 2.950ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Almandine Garnet 2.950ct Loose with Patch

Sold out

[Koshu Precious Stone Kiriko] Bicolor Amethyst 3.530ct Loose Color with Patch

Sold out

[Koshu Precious Stone Kiriko] Citrine 3.850ct loose

Sold out

[Koshu Precious Stone Kiriko] Lemon Quartz 3.890ct Loose

Sold out

[Koshu Precious Stone Kiriko plusthree] Tinkerbell Quartz 5.190ct Loose (Pink Fire Quartz) Aya "Collaboration" Patch included

Sold out

[Koshu precious stone Kiriko plusthree] Pink zircon 1.480ct loose Subaru "Collaboration" with patch

Sold out

[Koshu Precious Stone Kiriko] Opal 4.140ct loose

Sold out

【甲州貴石切子】アベンチュリンアクアマリン 1.900ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Aventurine Aquamarine 1.900ct Loose

Sold out

【甲州貴石切子】レピドクロサイトインクォーツ 1.590ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Lepidocrocite in Quartz 1.590ct Loose

Sold out

[Koshu Precious Stone Kiriko] Rose Amethyst 3.04ct Loose Subaru Sakura Kiriko

Sold out

[Koshu Precious Stone Kiriko] Rose Quartz 3.040ct Loose Subaru Sakura Kiriko with Patch

Sold out

【甲州貴石切子】グリーンアメジスト（プラシオライト） 3.340ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Green Amethyst (prasiolite) 3.340ct loose

Sold out

【甲州貴石切子】ロードライトガーネット 1.590ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Rhodolite Garnet 1.590ct Loose with Patch

Sold out

[Koshu precious stone Kiriko plusthree] Blue zircon 2.04ct loose "Collaboration" with emblem

Sold out

【甲州貴石切子】ロードライトガーネット 3.77ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Rhodolite Garnet 3.77ct Loose

Sold out

【甲州貴石切子】オレゴンサンストーン 2.350ctルース - カラッツSTORE

[Koshu Precious Stone Kiriko] Oregon Sunstone 2.350ct Loose

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.