Login

New stock

Sort by
Sold out 《Only a few left》 Brazilian Paraiba Tourmaline (Batalia) Gacha💎1.2mm 1 out of 10 stones contains Cu&Mn (CuO:2.1%, MnO:0.9%/CuO:1.6%, MnO:1.5%) 《Multiple purchase discounts available》

《Only a few left》 Brazilian Paraiba Tourmaline (Batalia) Gacha💎1.2mm 1 out of 10 stones contains Cu&Mn (CuO:2.1%, MnO:0.9%/CuO:1.6%, MnO:1.5%) 《Multiple purchase discounts available》
Sold out K18YGマダガスカル産ベキリーブルーガーネット（カラーチェンジガーネット ）0.201ct・デマントイドガーネットリング

[On sale from 10pm on 5/6] K18YG Madagascar Bekiri Blue Garnet (Color Change Garnet) 0.201ct Demantoid Garnet Ring
Sold out K18YG アメリカ産オレゴンサンストーンハーフエタニティリング （V字タイプ）

K18YG Oregon Sunstone Half Eternity Ring (V-shaped)
Sold out 【12523642掲載】ジェレメジェバイト 0.490ct原石

Jeremejevite 0.490ct rough stone from Namibia
Sold out Pt900/Pt850 ブラジル産パライバトルマリン 0.043ct ペンダント（ネックレス）

[On sale from 10pm on 5/5] Pt900/Pt850 Brazilian Paraiba Tourmaline 0.043ct Pendant (Necklace)
Sold out パラサイティックペリドット 0.034ルース

Parasitic Peridot 2.0mm/0.034 Loose
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） 0.363ctルース

[On sale from 22:00 on 5/5] Mali Garnet (Grossular/Andradite Garnet) 4.0mm/0.363ct Loose Stone with Certificate of Authenticity from the Republic of Mali
Sold out スタールビー 0.473ctルース

Sri Lankan Star Ruby 0.473ct Loose Stone with Certificate of Authenticity
Sold out Ethiopian oil-free emerald 0.32ct loose GIA

Ethiopian oil-free emerald 0.32ct loose GIA

Sold out コロンビア産エメラルド 0.922ct原石

Colombian emerald 0.922ct rough stone (Canutillo)
Sold out 【12527668掲載】スターガーネット 11.280ctルース

Indian Star Garnet 11.280ct Loose Stone (6 Rows)
Sold out K18YGマダガスカル産ペツォッタイト・アクアブルーカルセドニーハーフエタニティリング

[On sale from 10pm on 5/4] K18YG Madagascar petzotite and aqua blue chalcedony half eternity ring
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

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.