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Limited to 4 stones: 1 loose silky sapphire from Sri Lanka. Discounts available for multiple purchases.

Limited to 4 stones: 1 loose silky sapphire from Sri Lanka. Discounts available for multiple purchases. Sale price¥3,980
Limited to 9 stones: 1 Brazilian green beryl loose stone. Discounts available for multiple purchases.

Limited to 9 stones: 1 Brazilian green beryl loose stone. Discounts available for multiple purchases. Sale price¥3,580
Madeira Citrine from Brazil (6mm, round cut, November birthstone) {Multiple purchase discounts available}

Madeira Citrine from Brazil (6mm, round cut, November birthstone) {Multiple purchase discounts available} Sale price¥4,980
アキシナイト 0.500ctルース

Pakistani Axinite 0.500ct loose stone (green tint) Sale price¥12,800
Limited to 7 stones: One loose Madagascar sapphire (long hexagonal cut, approximately 5 x 3 mm) [Multiple purchase discounts available]

Limited to 7 stones: One loose Madagascar sapphire (long hexagonal cut, approximately 5 x 3 mm) [Multiple purchase discounts available] Sale price¥6,980
Limited to 9 stones: 1 rough petalite stone from Myanmar (average 6.0 carats) Multiple purchase discounts available

Limited to 9 stones: 1 rough petalite stone from Myanmar (average 6.0 carats) Multiple purchase discounts available Sale price¥2,980
チタン酸ストロンチウム 0.688ctルース

Strontium titanate 5mm/0.688ct loose stone Sale price¥12,800
Mozambique Ruby 0.544ct Loose Stone with Certificate of Authenticity

Mozambique Ruby 0.544ct Loose Stone with Certificate of Authenticity Sale price¥39,800
イエローダイヤモンド 0.188ctルース(FANCY INTENSE YELLOW, VS1)

Yellow diamond 0.188ct loose (FANCY INTENSE YELLOW, VS1) Sale price¥47,800
《New Tucson Arrivals - Limited to 13 Stones》Mexican Opal, including B-grade stones (Egg-in-Opal and Water Opal) 《Multiple Purchase Discount Available》

《New Tucson Arrivals - Limited to 13 Stones》Mexican Opal, including B-grade stones (Egg-in-Opal and Water Opal) 《Multiple Purchase Discount Available》 Sale price¥2,980
《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
エメラルド 15.219ctルース 日独鑑

Natural Emerald from Brazil, 15.219 ct, Loose Stone, Nichidoku Identification Report Sale price¥398,000
カメレオンダイヤモンド 0.118ctルース(LIGHT GRAYISH GREENISH YELLOW, VS-2)

Chameleon Diamond 3.1mm/0.118ct Loose Stone (LIGHT GRAYISH GREENISH YELLOW, VS-2) Sale price¥22,800
【12562858掲載】ベトナム産ルビー 1.758ctルース

1.758 ct Ruby Loose Stone from Vietnam with Identification Report Sale price¥49,800
スリランカ産イエローサファイア 0.517ctルース

[On Sale May 9th, 10 PM] Sri Lankan Yellow Sapphire 0.517ct Loose Gemstone Sale price¥12,800
[Sales End on Monday, June 30th] "Bungo to Alchemist" x KARATZ Collaboration Jewelry Bungo Ring [Dazai Osamu Model]

[Sales End on Monday, June 30th] "Bungo to Alchemist" x KARATZ Collaboration Jewelry Bungo Ring [Dazai Osamu Model] Sale priceFrom ¥25,800
Sold out 【金平糖カット】カラーシフトアメジスト 3.499ctルース

[Confetti Cut] Color Shift Amethyst 3.499ct Loose Stone
Sold out コーネルピン 0.616ctルース

[#202603 Campaign Gacha Use] Tanzanian Kornerupine 0.616ct Loose Stone
タンザニア産ゴールデンシーンサファイア 0.301ctルース

Tanzanian Golden Sheen Sapphire 3.8mm/0.301ct Loose Stone Sale price¥13,800
アイオライト 0.589ctルース

[Staff Selection] [Mr. KEN] Tanzanian Iolite 5.5mm/0.589ct Loose Stone (Semi-Custom Made Set) Sale price¥47,800
【スタッフセレクション】マダガスカル産アンデシン・ラブラドライト（通称名 レインボームーンストーン） 0.450ctルース（セミオーダーメイドセッ

[Staff Selection] Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 0.450ct Loose Stone (Semi-Custom Made Set) Sale price¥47,800
【スタッフセレクション】【KEN氏】タンザニア産ピンクトルマリン 0.290ctルース（セミオーダーメイドセッ

[Staff Selection] [Mr. KEN] Tanzanian Pink Tourmaline 0.290ct Loose (Semi-Custom Made Set) Sale price¥74,800
【スタッフセレクション】　【KEN氏】タンザニア産アイオライト 3.7mm/0.150ctルース（セミオーダーメイドセット）

[Staff Selection] [Mr. KEN] Tanzanian Iolite 3.7mm/0.150ct Loose Stone (Semi-Custom Made Set) Sale price¥47,800
タンザニア産コーネルピン 0.181ctルース

[Posted 12548743] Cornellpine from Tanzania 0.181ct loose Sale price¥29,800
タンザニア産コーネルピン 0.154ctルース

Tanzanian Kornerupine 0.154ct loose stone Sale price¥12,800
オレゴンサンストーン 0.713ctルース

Oregon Sunstone 0.713ct loose Sale price¥6,980
タンザナイト 0.760ctルース

Tanzanite 0.760ct loose stone (sugarloaf cut) Sale price¥9,800
ゴーシェナイト 0.572ctルース

Goshenite 5.7mm/0.572ct loose stone Sale price¥5,980
アメリカ産ハーキマーダイヤモンド 0.528ctルース

American Herkimer Diamond (Rock Crystal) 5.5mm/0.528ct Loose Sale price¥8,800
タンザニア産コーネルピンキャッツアイ 1.608ctルース

Tanzanian Kornerupine Cat's Eye 1.608ct Loose Stone Sale price¥6,980
インド産ムーンストーン 8mm/1.879ctルース

Indian Moonstone 8mm/1.879ct Loose Sale price¥6,980
ロードライトガーネット 0.810ctルース

Tanzanian Rhodolite Garnet 0.810ct Loose Stone Sale price¥9,800
ロードライトガーネット 0.448ctルース

Tanzanian Rhodolite Garnet 0.448ct Loose Stone Sale price¥6,980
タンザニア産バイカラータンザナイト 0.544ctルース（セミオーダーメイドセット）

[Staff Selection] Tanzanian Bicolor Tanzanite 0.544ct Loose Stone (Semi-Custom Made Set) Sale price¥55,800
ロシア産ダイヤモンド原石（ソーヤブル） 0.103ctルース

Russian Diamond Rough (Sawable) 0.103ct Loose (Trigon) Sale price¥25,800
非加熱ブラジル産パライバトルマリン 0.060ctルース（CuO:1.6%、MnO:2.3%）

Brazilian Paraiba Tourmaline 0.060ct Loose (CuO:1.6%, MnO:2.3%) Sale price¥45,800
Brazilian Green Tourmaline 0.332ct Loose Stone

Brazilian Green Tourmaline 0.332ct Loose Stone Sale price¥9,800
Brazilian Green Tourmaline 0.376ct Loose Stone

Brazilian Green Tourmaline 0.376ct Loose Stone Sale price¥9,800
Brazilian Green Tourmaline 0.825ct Loose Stone

Brazilian Green Tourmaline 0.825ct Loose Stone Sale price¥9,800
ブラジル産パライバトルマリン 0.360ctルース GIA鑑別書

Brazilian Paraiba Tourmaline 0.360ct Loose GIA Sale price¥298,000
ブラジル産ティンカーベルクォーツ（ピンクファイヤークォーツ） 0.344ctルース

Brazilian Tinkerbell Quartz (Pink Fire Quartz) 0.344ct Loose Stone Sale price¥12,800
タンザニア産バイカラーゾイサイト 0.486ctルース

Tanzania Bicolor Zoisite 4.7mm/0.486ct Loose Stone Sale price¥12,800
タンザニア産タンザナイト 0.497ctルース

Tanzanite from Tanzania 0.497ct loose stone Sale price¥12,800
タンザニア産バイカラーゾイサイト 0.540ctルース

Tanzania Bicolor Zoisite 4.8mm/0.540ct Loose Stone Sale price¥12,800
タンザニア産バイカラーゾイサイト 0.489ctルース

Tanzania Bicolor Zoisite 4.6mm/0.489ct Loose Stone Sale price¥12,800
オーストラリア産ブラックオパール 3.242ctルース

Australian black opal 3.242ct loose stone Sale price¥69,800
タンザニア産バイカラーゾイサイト 0.295ctルース

Tanzania Bicolor Zoisite 0.295ct Loose Stone Sale price¥8,800
タンザニア産タンザナイト 0.245ctルース

Tanzanite from Tanzania 0.245ct loose stone Sale price¥9,800

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.