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] Swiss Blue Topaz 4.73ct Loose with Patch

Sold out

[Koshu Precious Stone Kiriko] Sky Blue Topaz 4.50ct Loose with 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 plusthree] Scololite 1.790ct loose with patch

Sold out

[Koshu Precious Stone Kiriko] Green Tourmaline 3.88ct 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】UVタイプグロッシュラーガーネット 1.720ctルースワッペン付

[Koshu Precious Stone Kiriko] UV type grossular garnet 1.720ct loose with patch

Sold out

[Koshu Precious Stone Kiriko] UV type mint garnet 1.900ct 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

【甲州貴石切子】イエローフローライト 22.740ct《コラボ》ルースワッペン付

[Koshu Precious Stone Kiriko] Yellow Fluorite 22.740ct《Collaboration》Loose 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

【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） 1.910ctルースワッペン付《6月誕生石》

[Koshu Precious Stone Kiriko] Andesine Labradorite (commonly known as Rainbow Moonstone) 1.910ct loose with patch《June birthstone》

Sold out

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

Sold out

[Koshu Precious Stone Kiriko] Water Opal 2.030ct Loose with Patch

Sold out

[Koshu Precious Stone Kiriko] Ametrine 4.300ct loose with patch

Sold out

[Koshu Precious Stone Kiriko]《Sakura Kiriko》Citrine 3.480ct loose with emblem

Sold out

[Koshu Precious Stone Kiriko] Scololite 7.360ct loose with patch

Sold out

[Koshu Precious Stone Kiriko] Citrine 10mm/3.730ct loose with patch

Sold out

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

Sold out

【甲州貴石切子】カラーシフトアメジスト 3.780ct《コラボ》ルースワッペン付

[Koshu Precious Stone Kiriko] Color shift amethyst 3.780ct《Collaboration》 Loose with emblem

Sold out

[Koshu Precious Stone Kiriko] Fire Opal 4.60ct《Collaboration》loose with emblem

Sold out

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

Sold out

[Koshu Precious Stone Kiriko] Green Quartz 7.460ct《Collaboration》 Loose with emblem

Sold out

[Koshu Precious Stone Kiriko] Bicolor Citrine 2.830ct Loose

Sold out

【甲州貴石切子】ルチルレイテッドクォーツ 8mm/1.930ctルースワッペン付

[Koshu Precious Stone Cut] Rutilated Quartz (Rutilated Quartz) 8mm/1.930ct Loose Stone with Patch

Sold out

【甲州貴石切子】ルードヴィッヒアイトインペリドット 3.830ctルースワッペン付

[Koshu Precious Stone Kiriko] Ludwigite Imperidot 3.830ct loose with patch

Sold out

[Koshu Precious Stone Kiriko] Rose Quartz 2.920ct Loose with Patch

Sold out

[Koshu Precious Stone Kiriko] Lemon Quartz 3.270ct Loose with Patch

Sold out

【甲州貴石切子plusthree】デュモルチェライトインクォーツ 17.73ctルース昴《コラボ》ワッペン付

[Koshu Precious Stone Kiriko PlusThree] Dumortierite in Quartz 17.73ct Loose Subaru "Collaboration" with Patch

Sold out

【甲州貴石切子plusthree】ティンカーベルクォーツ（ピンクファイヤークォーツ） 9.370ctルース《コラボ》ワッペン付

[Koshu Precious Stone Kiriko PlusThree] Tinker Bell Quartz (Pink Fire Quartz) 9.370ct Loose "Collaboration" with emblem

Sold out

[Koshu Precious Stone Kiriko] Rhodolite Garnet 2.07ct Loose "Collaboration" with Patch

Sold out

[Koshu Precious Stone Kiriko] Amethyst 3.60ct loose

Sold out

[Koshu precious stone Kiriko plusthree] Amethyst 2.26ct loose light with patch

Sold out

[Koshu Precious Stone Kiriko] Almandine Garnet 1.360ct Loose

Sold out

[Koshu Precious Stone Kiriko] Peridot 1.080ct loose with emblem

Sold out

[Koshu precious stone Kiriko plusthree] Peridot 1.00ct loose with patch

Sold out

【12529533掲載】ラベンダークォーツ（スコロライト） 5.410ctルース

[Koshu Precious Stone Kiriko] Scololite 5.410ct loose (Sakura Kiriko)

Sold out

[Koshu Precious Stone Kiriko] Rhodolite Garnet 2.980ct Loose

Sold out

[Koshu Precious Stone Kiriko] Lemon Quartz 141.912ct loose with patch

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

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.

The fifth reprint has been decided and is now on sale at bookstores nationwide and online.

Written by KARATZ, book “Jewelry Illustrated Book”

The book provides explanations about over 300 types of gemstones, from new standard birthstones to rare stones that are hard to find, as well as a diary of our company representative, Mr. Koyama's, gemstone shopping experience in Thailand and Sri Lanka, and tips for photographing gemstones, allowing you to learn about the appeal of gemstones from various perspectives.

KARATZ・Five Commitments