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Sold out Pt950ブラジル産アレキサンドライト0.301ct・ダイヤモンドリング

Pt950 Brazilian Alexandrite 0.301ct Diamond Ring
Sold out ブルガリア産グリーンスファレライト 0.847ctルース

Bulgarian Green Sphalerite 0.847ct Loose Stone by Nikkei
Sold out ジンバブエ産バイカラーユークレース 0.094ctルース

[On sale 5/3 at 22:00] Zimbabwean bicolor euclase 0.094ct loose stone with certificate of authenticity
Sold out Limited quantity: Brazilian Paraiba tourmaline, 1 stone loose (Batalha mine, oval cut) Multiple purchase discounts available

Limited quantity: Brazilian Paraiba tourmaline, 1 stone loose (Batalha mine, oval cut) Multiple purchase discounts available
Sold out メキシコ産ウォーターオパール 0.304ctルース

Mexican water opal 0.304ct loose stone
Sold out メキシコ産ウォーターオパール 0.194ctルース

Mexican water opal 0.194ct loose stone
Sold out メキシコ産ウォーターオパール 0.300ctルース

Mexican water opal 0.300ct loose stone
Sold out メキシコ産ウォーターオパール 0.378ctルース

Mexican water opal 0.378ct loose stone
Sold out メキシコ産オパール 0.513ctルース

Mexican Opal 0.513ct Loose
Sold out メキシコ産オパール 0.282ctルース

Mexican Opal 0.282ct Loose
Sold out オーストラリア産オパール 0.227ctルース

Australian Opal 0.227ct Loose
Sold out ブラジル産ロードナイト 0.710ctルース

Brazilian rhodonite 0.710ct loose stone
Sold out ブラジル産グリーン・スポジュメン 0.923ctルース

Brazilian Green Spodumene 0.923ct Loose Stone
Sold out ブラジル産グリーン・スポジュメン 1.164ctルース

Brazilian Green Spodumene 1.164ct Loose Stone
Sold out ブルーサファイア 0.194ctルース

Madagascar Blue Sapphire 0.194ct Loose
Sold out イエローサファイア 0.302ctルース

Sri Lankan Yellow Sapphire 0.302ct Loose
Sold out Mali Garnet (Grossular/Andradite Garnet) 4.0mm/0.355ct Loose Stone with Certificate of Authenticity

Mali Garnet (Grossular/Andradite Garnet) 4.0mm/0.355ct Loose Stone with Certificate of Authenticity
Sold out マリ共和国産マリガーネット（グロッシュラー/アンドラダイト・ガーネット） 4.0mm/0.408ctルース 鑑別書

Mali Garnet (Grossular/Andradite Garnet) 4.0mm/0.408ct Loose Stone with Certificate of Authenticity
Sold out [On sale from 10pm on 5/5] Limited to 11 stones Russian Demantoid Garnet (2-2.3mm, round cut, with horsetail) 1 stone [Multiple purchase discounts available]

[On sale from 10pm on 5/5] Limited to 11 stones Russian Demantoid Garnet (2-2.3mm, round cut, with horsetail) 1 stone [Multiple purchase discounts available]
Sold out Gem Gacha💎 1 Paraiba Tourmaline from Brazil (Batalha mine, 2.5-3.0mm, includes blue)

Gem Gacha💎 1 Paraiba Tourmaline from Brazil (Batalha mine, 2.5-3.0mm, includes blue)
Sold out バイカラーサファイア 0.417ctルース

Tanzanian bicolor sapphire 0.417ct loose stone
Sold out Limited to 5 stones: 1 Indian Iolite Sunstone (impregnated) loose stone (average 6.6 carats, cabochon cut) Multiple purchase discounts available

Limited to 5 stones: 1 Indian Iolite Sunstone (impregnated) loose stone (average 6.6 carats, cabochon cut) Multiple purchase discounts available
Sold out Limited to 9 stones: 1 colorless apatite loose stone from Madagascar (average 0.30ct, many inclusions) Multiple purchase discounts available

Limited to 9 stones: 1 colorless apatite loose stone from Madagascar (average 0.30ct, many inclusions) Multiple purchase discounts available
Sold out Limited to 5 stones: 1 colorless apatite loose stone from Madagascar (all stones come with identification certificate, average 0.40ct) Discounts for multiple purchases available

Limited to 5 stones: 1 colorless apatite loose stone from Madagascar (all stones come with identification certificate, average 0.40ct) Discounts for multiple purchases available
Sold out Diamond 3.2mm/0.129ct loose (F, SI-1, EXCELLENT)

Diamond 3.2mm/0.129ct loose (F, SI-1, EXCELLENT)
Sold out American Benitoite 5-stone set 2.0mm/0.124ct loose stone

American Benitoite 5-stone set 2.0mm/0.124ct loose stone
Sold out 南アフリカ産ロードクロサイト 0.680ctルース

South African Rhodochrosite 5.5mm/0.680ct Loose Stone
Sold out 【甲州貴石切子】スフェーン 1.471ctルース

[Koshu Precious Stones plusthree] Madagascar Sphene 1.471ct Loose Stone [Collaboration] Patch

Sold out 【甲州貴石切子】アパタイト 2.310ctルース

[Koshu Precious Stones plusthree] Madagascar Apatite 2.310ct Loose Color "Collaboration" Patch

Sold out Limited to 6 stones: 1 loose sphene stone from Madagascar (round cut, 4mm) Multiple purchase discounts available

Limited to 6 stones: 1 loose sphene stone from Madagascar (round cut, 4mm) Multiple purchase discounts available
Sold out 【甲州貴石切子】ロンドンブルートパーズ 10.514ct《コラボ》ルース ワッペン付

[Koshu Precious Stone Cutting] London Blue Topaz 10.514ct {Collaboration} Loose Patch
Sold out ダイオプテーズ 0.121ctルース 日独鑑

Dioptase from Namibia 0.121ct loose Japanese-German book
Sold out ブラッドショットアイオライトサンストーン 1.090ctルース

Indian Bloodshot Iolite Sunstone 1.090ct Loose
Sold out ブラジル産パライバトルマリン 0.047ctルース（CuO:2.2%、MnO:3.5%）

Paraiba tourmaline from Brazil 0.047ct loose (CuO:2.2%, MnO:3.5%)

Sold out ティンカーベルクォーツ（ピンクファイヤークォーツ） 3.616ctルース

Brazilian Tinkerbell Quartz (Pink Fire Quartz) 3.616ct Loose Stone
Sold out デンドリティッククォーツ 1.547ctルース

Brazilian Dendritic Quartz 1.547ct Loose Stone
Sold out ガーデンクォーツ 6.760ctルース

Brazilian Garden Quartz 11.6mm/6.760ct Loose Stone
Sold out バイカラートルマリン 1.039ctルース

Brazilian bicolor tourmaline 1.039ct loose stone

Sold out ローズクォーツ 33.630ctルース

Brazilian Rose Quartz 33.630ct Loose Stone
Sold out エメラルド 3mm/0.126ct ルース

Colombian emerald 3mm/0.126ct loose

Sold out [Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]

[Limited to 7 stones] Gem gacha💎 Australian opal or Mexican cantera opal 1 loose stone (with defects) [Multiple purchase discount available]
Sold out Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available

Limited to 2 stones: 1 Australian opal loose stone (pear cut) Multiple purchase discounts available
Sold out Limited to 7 stones: 1 Hokkaido rhodochrosite loose stone (4mm, rose cut) Multiple purchase discounts available

Limited to 7 stones: 1 Hokkaido rhodochrosite loose stone (4mm, rose cut) Multiple purchase discounts available
Sold out Limited to 3 stones: Brazilian Trapiche Amethyst (with mother rock) 1 loose stone (average 33ct, February birthstone) Multiple purchase discounts available

Limited to 3 stones: Brazilian Trapiche Amethyst (with mother rock) 1 loose stone (average 33ct, February birthstone) Multiple purchase discounts available
Sold out モスアゲート 0.505ctルース

Indian Moss Agate 0.505ct Loose Stone

Sold out モスアゲート 0.575ctルース

Indian Moss Agate 0.575ct Loose Stone
Sold out ブラジル産デュモルチェライトインクォーツ 1.512ctルース

Brazilian Dumortierite in Quartz 1.512ct loose stone
Sold out ブラジル産アクアマリン 0.721ctルース

Brazilian Aquamarine 0.721ct Loose Stone

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の取り組みと社会貢献

業界発展のための後進育成や事業協力、宝石の国スリランカの子どもたちへの支援活動など、KARATZの取り組みについてご紹介いたします。

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.