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Sold out タンザニア産バイカラーゾイサイト 0.299ctルース

Tanzania Bicolor Zoisite 0.299ct Loose Stone

Sold out アイアンオパール 184.250ctルース　日独鑑

Iron Opal 184.250ct Loose Stone, Japan-Germany Exchange
Sold out ナイジェリア産イエローベリル（ヘリオドール） 4mm/0.188ctルース

Nigerian Yellow Beryl (Heliodor) 4mm/0.188ct Loose Stone
Sold out ブラジル産アレキサンドライト 0.125ctルース

Brazilian Alexandrite 0.125ct loose stone
Sold out タンザニア産バイカラータンザナイト 2.454ct原石

Tanzanian bicolor tanzanite rough stone 2.454ct

Sold out 【クローバーインカット】オレゴンサンストーン 7mm/1.092ct《コラボ》ルース ワッペン

[Clover in cut] Oregon Sunstone 7mm/1.092ct {Collaboration} Loose patch
Sold out アフガニスタン産ハックマナイト 0.115ctルース

Afghanistan Hackmanite 0.115ct loose stone
Sold out ブラジル産ウォーターメロントルマリン 7.959ct原石

Brazilian Watermelon Tourmaline Rough Stone 7.959ct
Sold out 【12548842掲載】スリランカ産イエローサファイア 0.555ctルース

Sri Lankan Yellow Sapphire 0.555ct Loose
Sold out タンザニア産タンザナイト 6mm/0.889ct《コラボ》ルース ワッペン

[Sakura Shape] Tanzanite from Tanzania 6mm/0.889ct {Collaboration} Loose Patch

Sold out 【さくらシェイプ】YAG（イットリウムアルミニウムガーネット） 7.0mm/1.985ct《コラボ》ルース ワッペン

[Sakura Shape] YAG (Yttrium Aluminum Garnet) 7.0mm/1.985ct {Collaboration} Loose Patch
Sold out Pt950ビルマ産ルビー0.21ct・ルビーリング

Pt950 Burmese Ruby 0.21ct Ruby Ring
coming soon Pt950ダイヤモンド（カボションカット）0.131ct リング

Pt950 Diamond (Cabochon Cut) 0.131ct Ring Sale price¥158,000
coming soon [Available at 10:00 PM on December 10, 2025] Adult Sebon Star Adjuster Charm (Not available for individual purchase)

[Available at 10:00 PM on December 10, 2025] Adult Sebon Star Adjuster Charm (Not available for individual purchase) Sale price¥15,800
Sold out Limited to 4 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.3mm/average 0.13ct) Multiple purchase discounts available

Limited to 4 stones: 1 Brazilian Alexandrite loose stone (rose cut, 3.3mm/average 0.13ct) Multiple purchase discounts available

Sold out Limited to 7 stones: 1 loose Sri Lankan spinel (lozenge cut) stone. Discounts available for multiple purchases.

Limited to 7 stones: 1 loose Sri Lankan spinel (lozenge cut) stone. Discounts available for multiple purchases.
Sold out 【12551483掲載】ベトナム産非加熱シルキーピンクサファイア 0.433ctルース

Unheated silky pink sapphire from Vietnam 0.433ct loose

Sold out ロンドンブルーダイヤモンド（トリートメント）

London Blue Diamond (Treatment) 0.202ct Loose (FANCY DEEP GREEN BLUE, VS2)

Sold out 合成ルチル 0.915ctルース

Synthetic rutile 5.8mm/0.915ct loose stone
Sold out アメリカ産オレゴンサンストーン 3.507ctルース

Oregon Sunstone 3.507ct loose stone from the United States
Sold out ブラジル産サンタマリアアクアマリン 0.190ctルース

Brazilian Santa Maria Aquamarine 0.190ct loose stone
Sold out パキスタン産ヴェイリネナイト 0.059ctルース

Pakistani Veirinite 0.059ct loose stone
Sold out Madagascar sphene 0.423ct loose stone

Madagascar sphene 0.423ct loose stone
Sold out 南アフリカ産スギライト 1.330ctルース

South African Sugilite 1.330ct loose stone
Sold out コロンビア産エメラルド 0.215ctルース

Colombian emerald 0.215ct loose stone
Sold out コロンビア産エメラルド 0.258ctルース

Colombian emerald 0.258ct loose stone
Sold out Hana Shinju (South Sea pearl) 17.321ct loose

Hana Shinju (South Sea pearl) 17.321ct loose

Sold out Nigerian Cobalt Garnite 0.311ct Loose Stone JTL Catalog

Nigerian Cobalt Garnite 0.311ct Loose Stone JTL Catalog
Sold out ブラジル産パライバトルマリン 0.202ctルース

Brazilian Paraiba Tourmaline 0.202ct loose stone (CuO: 0.6%, MnO: 0.1%)
Sold out Top Quality Benitoite 13 Stone Half Eternity Ring Set (2.0mm)

Top Quality Benitoite 13 Stone Half Eternity Ring Set (2.0mm)
Sold out Tanzanian Kornerupine 3.2mm/0.129ct Loose Stone

Tanzanian Kornerupine 3.2mm/0.129ct Loose Stone
Sold out ナイジェリア産コバルトガーナイト 0.707ctルース

Nigerian Cobalt Garnite 0.707ct Loose Stone JTL Catalog
Sold out ブラジル産パライバトルマリン 0.120ct《エイトリータ》ルース（CuO:2.0%、MnO:0.7%）

Brazilian Paraiba Tourmaline 0.120ct "Eitrea" loose stone (CuO: 2.0%, MnO: 0.7%)
Sold out ブラジル産パライバトルマリン 0.072ctルース

Paraiba tourmaline from Brazil 0.072ct loose
Sold out 中国・ヤオガンシャン産フローライト 72.518ct原石

Fluorite rough stone from Yaogangshan, China, 72.518ct
Sold out 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） 0.631ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 0.631ct loose stone
Sold out 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） 1.447ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 1.447ct loose stone
Sold out Limited to 6 stones: Brazilian Medusa Quartz (Paraiba Quartz) cat cut 1 stone loose (6mm) Multiple purchase discount available

Limited to 6 stones: Brazilian Medusa Quartz (Paraiba Quartz) cat cut 1 stone loose (6mm) Multiple purchase discount available
Sold out タンザニア産バイカラーサファイア 0.818ctルース（トリカラーサファイア）

Tanzanian bicolor sapphire 0.818ct loose stone (tricolor sapphire)
Sold out Limited to 25 stones: Brazilian Paraiba Tourmaline (including bicolor, Batalha) rough stones, average size 0.1ct. Discounts for multiple purchases available.

Limited to 25 stones: Brazilian Paraiba Tourmaline (including bicolor, Batalha) rough stones, average size 0.1ct. Discounts for multiple purchases available.
Sold out [Sales End on Thursday, October 31st] "Given the Movie: Hiiragi Mix" x KARATZ Collaboration Jewelry Sato Mafuyu Model

[Sales End on Thursday, October 31st] "Given the Movie: Hiiragi Mix" x KARATZ Collaboration Jewelry Sato Mafuyu Model

Sold out [3/31 Reception ends] "Given the Movie Hiiragimix" x KARATZ Collaboration Jewelry Uenoyama Ritsuka Model Ring

[3/31 Reception ends] "Given the Movie Hiiragimix" x KARATZ Collaboration Jewelry Uenoyama Ritsuka Model Ring

Sold out [3/31 Reception ends] "Given the Movie: Hiiragi Mix" x KARATZ Collaboration Jewelry Haruki Nakayama Model Ring

[3/31 Reception ends] "Given the Movie: Hiiragi Mix" x KARATZ Collaboration Jewelry Haruki Nakayama Model Ring

Sold out [3/31 Reception ends] "Given the Movie Hiiragimix" x KARATZ Collaboration Jewelry Akihiko Kaji Model Ring

[3/31 Reception ends] "Given the Movie Hiiragimix" x KARATZ Collaboration Jewelry Akihiko Kaji Model Ring

Sold out Limited to 18 stones, Russian Phenakite rough, average 2.7ct, 1 stone, multiple purchase discounts available

Limited to 18 stones, Russian Phenakite rough, average 2.7ct, 1 stone, multiple purchase discounts available
Sold out [3/31 Reception ends] "Given the Movie: Hiiragi Mix" x KARATZ Collaboration Jewelry Given Pendant & Necklace Extension Chain

[3/31 Reception ends] "Given the Movie: Hiiragi Mix" x KARATZ Collaboration Jewelry Given Pendant & Necklace Extension Chain

Sold out デュモルチェライトインクォーツ 2.870ctルース

Brazilian Dumortierite in Quartz 2.870ct loose stone

Sold out ブラジル産パライバトルマリン 0.134ctルース（CuO:0.9%,MnO:0.2%）

Paraiba tourmaline from Brazil 0.134ct loose (CuO:0.9%,MnO:0.2%)

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.