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Vertical: 4.1 - 5.0mm

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coming soon [Lottery Sale 0530_03] Internally Flawless Diamond 4.2mm/0.272ct Loose (D, IF, 3Excellent H&C) GIA

[Lottery Sale 0530_03] Internally Flawless Diamond 4.2mm/0.272ct Loose (D, IF, 3Excellent H&C) GIA Sale price¥148,000
Sold out ブラジル産カシャライアメジスト 0.387ctルース

[On sale June 3rd, 10 PM JST] Brazilian Kasharaiya Amethyst 0.387ct Loose Stone
Sold out 中国・湖南省シンシャ（辰砂・シナバー） 0.882ctルース

[On sale 5/18 at 10 PM] Cinnabar from Hunan, China, 0.882 ct Loose Stone, with certification
Sold out 中国・湖南省シンシャ（辰砂・シナバー） 0.469ctルース

[On sale May 17th at 10 PM] Chinese Hunan Cinnabar 0.469ct Loose Stone with Certificate of Authenticity
Sold out カシミール産非加熱サファイア 0.080ctルース

Kashmir unheated sapphire 2.6mm/0.09ct loose GIA

Sold out スリランカ産クリソベリルキャッツアイ 0.507ctルース

[On sale May 15th at 10 PM] Sri Lankan Chrysoberyl Cat's Eye 4.3mm/0.507ct Loose Stone
Sold out GGG（ガドリウムガリウムガーネット） 0.658ctルース

[For sale May 13 at 10 PM] GGG (Gadolinium Gallium Garnet) 4.0mm/0.658ct Loose Stone
Sold out ティールブルーサファイア 0.275ctルース

[Sale on May 12th at 10 PM] Teal Blue Sapphire 0.275 ct Loose Stone
Sold out Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan

Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan
Sold out インターナリーフローレスダイヤモンド（H&C） 0.300ctルース(D, IF, 3Excellent H&C)

Internally Flawless Diamond (H&C) 4.3mm/0.300ct Loose (D, IF, 3Excellent H&C) GIA&CGL

Sold out ダイヤモンド 0.310ctルース(E, VS1, 3Excellent)

Diamond 4.3mm/0.310ct Loose (E, VS1, 3Excellent) GIA

Sold out フローレスダイヤモンド（H&C） 0.230ctルース(D, FL, 3Excellent H&C)

Flawless Diamond (H&C) 4.0mm/0.230ct Loose (D, FL, 3Excellent H&C) GIA & Central Gem Laboratory

coming soon 【Lottery Sale 0530_04】Flawless Diamond (H&C) 4.2mm/0.280ct Loose (D, FL, 3Excellent H&C) GIA&CGL

【Lottery Sale 0530_04】Flawless Diamond (H&C) 4.2mm/0.280ct Loose (D, FL, 3Excellent H&C) GIA&CGL Sale price¥210,000
coming soon 【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab

【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥218,000
Sold out 【32501881掲載】インターナリーフローレスダイヤモンド（H&C） 0.340ctルース(F, IF, 3Excellent H&C)

Internally Flawless Diamond (H&C) 4.5mm/0.340ct Loose (F, IF, 3Excellent H&C) GIA & CBT

Sold out ボリビア産フォスフォフィライト 0.448ctルース

Bolivian Phosphophyllite 0.448ct Loose Stone with Certificate

Sold out コロンビア産エメラルド 4.7mm/0.468ctルース

[On sale 5/5 at 22:00] Colombian Emerald 4.7mm/0.468ct Loose Stone

Sold out Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)

Brazilian Paraiba Tourmaline 0.216ct loose stone (CuO:1.2%, MnO:2.7%)
Sold out 【12562579掲載】ナミビア産ジェレメジェバイト 0.355ctルース

Jeremejevite from Namibia 0.355ct Loose Stone with Certification
Sold out ブラジル産インディゴライトトルマリン 0.105ctルース

[On sale May 5th at 10 PM JST] Brazilian Indicolite Tourmaline 0.105ct Loose Stone with Appraisal Report
Sold out 【32501804掲載】ダイヤモンド 0.185ctルース(I, SI1)

Diamond 0.185ct Loose Stone (I, SI1, Ashoka Cut)
Sold out 0.430ct Unheated Sapphire Loose Stone from Kashmir

0.430ct Unheated Sapphire Loose Stone from Kashmir

Sold out カナダ産ダイヤモンド原石（ソーヤブル） 0.328ct原石（トライゴン有り）

Canadian raw diamond (sawable) 0.328ct raw (with trigons)
Sold out Ruby 0.289ct loose stone by Takakikyo

Ruby 0.289ct loose stone by Takakikyo

Sold out [12560354] Zimbabwean Bicolor Euclase 0.206ct Loose Stone

[12560354] Zimbabwean Bicolor Euclase 0.206ct Loose Stone
Sold out 【12558576掲載】パキスタン産ヴェイリネナイト 0.150ctルース

Pakistan Veininite 0.150ct Loose Gemstone with Certificate
coming soon ピンクサファリン 0.239ctルース

0.239ct Loose Pink Sapphire from Madagascar, Japan/Germany Sale price¥49,800
Sold out 【32501858掲載】グレーダイヤモンド 0.141ctルース(FANCY GRAY, I-1)

Loose Gray Diamond 0.141ct (FANCY GRAY, I-1)
Sold out 【12562555掲載】オーストラリア産ブラックオパール 0.248ctルース

Australian Black Opal 0.248ct Loose Stone

Sold out Blue Garnite from Nigeria 0.514ct Ruth Japanese-German Edition

Blue Garnite from Nigeria 0.514ct Ruth Japanese-German Edition
Sold out 【12562400掲載】メキシコ産オパール 0.265ctルース

[Cat Cut] Mexican Opal 0.265ct Loose Stone
Sold out 【12562398掲載】メキシコ産ファイアオパール 0.291ctルース

【Cat Cut】Mexican Fire Opal Loose Stone 0.291ct
Sold out カナダ産ナトロライト 0.355ctルース

Canadian Natrolite 5.0mm/0.355ct Loose Stone with Japan-Germany Gemological Report

Sold out American Neptunite 0.207ct Loose Stone with Certificate of Authenticity

American Neptunite 0.207ct Loose Stone with Certificate of Authenticity
Sold out 【12562061掲載】アメリカ産ネプチュナイト 0.256ctルース

0.256ct Neptunite from the USA, with a certificate

Sold out 【12562017掲載】ブラジル産ヘルデライト 0.421ctルース

Brazilian Herderite 0.421ct loose stone

Sold out 【12561929掲載】合成ルチル 0.505ctルース

Synthetic rutile 0.505ct loose

Sold out Tanzanian Color Change Garnet 0.509ct Loose Stone

Tanzanian Color Change Garnet 0.509ct Loose Stone
Sold out ピンクサファリン 0.178ctルース

0.178ct Madagascar Pink Sapphire Loose Stone, Japan-German

Sold out パキスタン産ヴィータニエミアイト 0.184ctルース

Pakistani Vitaniemiite 0.184ct loose stone

Sold out Myanmar color change zircon 0.439ct loose stone

Myanmar color change zircon 0.439ct loose stone
Sold out Rainbow Garnet (Andradite Garnet) from Tenkawa Village, Nara Prefecture 4.8mm/0.612ct Loose

Rainbow Garnet (Andradite Garnet) from Tenkawa Village, Nara Prefecture 4.8mm/0.612ct Loose
Sold out カラーチェンジジルコン 0.556ctルース

Burmese color-change zircon 0.556 ct loose

Sold out Sri Lankan Forsterite 0.231ct Loose Stone, Japan-German

Sri Lankan Forsterite 0.231ct Loose Stone, Japan-German

Sold out Tanzanite from Tanzania 4.5mm/0.390ct Loose Stone AIGS

Tanzanite from Tanzania 4.5mm/0.390ct Loose Stone AIGS
Sold out 0.336 ct Tanzanian Kornerupine Loose Gemstone

0.336 ct Tanzanian Kornerupine Loose Gemstone
Sold out Afghan Kunzite 0.606ct Loose Stone

Afghan Kunzite 0.606ct Loose Stone
Sold out USA Oregon Sunstone 5.0mm/0.443ct Loose

USA Oregon Sunstone 5.0mm/0.443ct Loose

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.