Login

Pre-sale

Sort by
Sold out [12560934] Shinsha (Cinnabar) 0.884ct Loose Stone

[12560934] Shinsha (Cinnabar) 0.884ct Loose Stone
Sold out [On Sale 10/13 at 10 PM] [Limited to 10 Stones] Bicolor Gacha 💎 Includes two Zimbabwean euclase stones (average 0.088 carats), a 1.03 carat bicolor sapphire, a bicolor chrysoberyl, and more. [Multiple purchase discounts available]

[On Sale 10/13 at 10 PM] [Limited to 10 Stones] Bicolor Gacha 💎 Includes two Zimbabwean euclase stones (average 0.088 carats), a 1.03 carat bicolor sapphire, a bicolor chrysoberyl, and more. [Multiple purchase discounts available]
Sold out [On Sale 10/13 at 10 PM] [Limited to 11 Stones] Rare Stone Gacha! 💎 Two 0.23ct Paraiba Tourmalines from Batalha, Brazil, a Pink Diamond, and a Benitoite Loose Stone [Multiple Purchase Discounts Available]

[On Sale 10/13 at 10 PM] [Limited to 11 Stones] Rare Stone Gacha! 💎 Two 0.23ct Paraiba Tourmalines from Batalha, Brazil, a Pink Diamond, and a Benitoite Loose Stone [Multiple Purchase Discounts Available]
Sold out One loose, oil-free emerald from Russia (2.8mm, round cut) (Multiple purchase discounts available)

One loose, oil-free emerald from Russia (2.8mm, round cut) (Multiple purchase discounts available)
Sold out [On Sale 10/13 at 10 PM] [Limited to 6 stones] One loose, oil-free emerald from Russia (3.2mm, round cut) [Multiple purchase discounts available]

[On Sale 10/13 at 10 PM] [Limited to 6 stones] One loose, oil-free emerald from Russia (3.2mm, round cut) [Multiple purchase discounts available]
Sold out [Available at 10/17 10 PM] Limited Stock! Color-Change Gacha! 💎 Burmese Color-Change Zircon, Color-Shift Sapphire, Color-Shift Cobalt Spinel, and More! Discounts Available for Multiple Purchases!

[Available at 10/17 10 PM] Limited Stock! Color-Change Gacha! 💎 Burmese Color-Change Zircon, Color-Shift Sapphire, Color-Shift Cobalt Spinel, and More! Discounts Available for Multiple Purchases!
coming soon [Sale at 10:00 PM on October 13th] [Sakura In-Cut] Sri Lanka Ratnapura Sapphire 6.0mm/0.839ct Loose

[Sale at 10:00 PM on October 13th] [Sakura In-Cut] Sri Lanka Ratnapura Sapphire 6.0mm/0.839ct Loose Sale price¥59,800
coming soon インターナリーフローレスダイヤモンド（H&C） 4.45mm/0.305ctルース(F, IF, 3Excellent H&C) GIA&中宝

[On Sale 10/12 at 10 PM] Internally Flawless Diamond (H&C) 4.45mm/0.305ct Loose (F, IF, 3 Excellent H&C) Sale price¥98,000
Sold out ブラジル産レインボーアクアマリン 2.698ctルース

[10/11 22:00 Sale] Brazilian Rainbow Aquamarine (Iridescent Aquamarine) 2.698ct Loose Stone
Sold out インターナリーダイヤモンド 0.25ルース(E, IF, 3Excellent) GIA

[On Sale at 10 PM on October 11th] Internal Diamond 4.1mm/0.250ct Loose (F, IF, 3 Excellent) GIA
coming soon K18YGコロンビア産エメラルド0.062ct・ダイヤモンドリング

18K Yellow Gold Colombian Emerald 3.0mm/0.062ct Diamond Ring Sale price¥79,800
Sold out [Available at 10 PM on 10/11] [Limited to 15 stones] Blue Stone Gacha (Top Color Benitoite 2.0mm, Paraiba Tourmaline in Quartz, Unheated Yogo Sapphire) [Multiple Purchase Discounts Available]

[Available at 10 PM on 10/11] [Limited to 15 stones] Blue Stone Gacha (Top Color Benitoite 2.0mm, Paraiba Tourmaline in Quartz, Unheated Yogo Sapphire) [Multiple Purchase Discounts Available]
Sold out [On Sale 10/10 at 10 PM] [Limited to 20 stones] Koshu Precious Stone Kiriko Plus Three: Includes two carefully cut Oregon Sunstones in the Loose Stone Gacha [Multiple purchase discounts available]

[On Sale 10/10 at 10 PM] [Limited to 20 stones] Koshu Precious Stone Kiriko Plus Three: Includes two carefully cut Oregon Sunstones in the Loose Stone Gacha [Multiple purchase discounts available]
Sold out 奈良県天川村産レインボーガーネット（アンドラダイトガーネット） 0.577ctルース

[On Sale at 10 PM on October 18th] Rainbow Garnet (Andradite Garnet) 0.577ct Loose Stone from Tenkawa Village, Nara Prefecture
Sold out ブラジル産ゴーシェナイト 1.611ctルース

[10/17 22:00 Sale] Brazilian Gashenite 1.611ct Loose Stone
coming soon マダガスカル産ホットピンクサファイア 1.120ctルース

[Lottery sale: Friday, October 31st, 10:00 AM] 102510_Madagascar Hot Pink Sapphire 1.120ct Loose GIA Sale price¥158,000
Sold out バイカラーゾイサイト 0.745ctルース

[On Sale at 10 PM on October 20th] Tanzanian Bicolor Zoisite 5.5mm/0.745ct Loose Stone
coming soon 【12552511掲載】ピンクダイヤモンド 0.296ctルース

[12552511] Pink diamond 0.296ct loose stone Sale price¥188,000
Sold out ガーネット 0.979ctルース

[Posted in 12548908] Garnet 0.979ct loose
coming soon 【12548177掲載】ノンオイルレッドベリル 0.060ctルース

[12548177 published] Non-oil red beryl 0.060ct loose Sale price¥128,000
coming soon 【12548173掲載】コロンビア産ノンオイルエメラルド 0.060ctルース

[Posted 12548173] Colombian oil-free emerald 0.060ct loose Sale price¥89,800
coming soon Pink spinel 1.870ct loose (briolette cut) Japanese-German edition

Pink spinel 1.870ct loose (briolette cut) Japanese-German edition Sale price¥128,000
Sold out [On Sale 10/4 at 10 PM] Limited to 3 Stones: Synthetic Black Moissanite Loose Stone (2.5mm, Round Cut) [Multiple Purchase Discounts Available]

[On Sale 10/4 at 10 PM] Limited to 3 Stones: Synthetic Black Moissanite Loose Stone (2.5mm, Round Cut) [Multiple Purchase Discounts Available]
Sold out ジンバブエ産バイカラーユークレース 0.352ctルース

[On Sale at 10 PM on October 5th] Zimbabwean Bicolor Euclase 0.352ct Loose Stone
Sold out ブラジル産フローライトインクォーツ 3.507ctルース

[On Sale at 10pm on October 5th] Brazilian Fluorite in Quartz 3.507ct Loose Stone
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） 5.001ctルース

Tinker Bell Quartz (Pink Fire Quartz) 5.001ct loose
Sold out 【ルージュカット】アルマンディンガーネット 1.725ctルース

[Rouge cut] Almandine garnet 1.725ct loose
Sold out Brazilian alexandrite 0.066ct loose (Hemachita mine)

Brazilian alexandrite 0.066ct loose (Hemachita mine)
coming soon 【12543590掲載】グリーンランド産タグトゥパイト 0.420ctルース

[Posted in 12543590] Tagtupite from Greenland 0.420ct loose Sale price¥198,000
Sold out ラベンダー翡翠（ヒスイ） 78.496ctルース 中宝

Lavender Jade (Jade) 78.496ct Loose Medium Treasure
Sold out ブラジル産レインボースキャポライト 0.652ctルース

Brazilian rainbow scapolite 6mm/0.652ct loose
Sold out ブラジル産メデューサクォーツ（パライバクォーツ） 1.008ctルース

Brazilian Medusa Quartz (Paraiba Quartz) 1.008ct loose
Sold out ブラジル産メデューサクォーツ（パライバクォーツ） 2.248ctルース

Brazilian Medusa Quartz (Paraiba Quartz) 2.248ct loose
Sold out コンゴ産ヘミモルファイト 0.537ctルース

Hemimorphite from Congo 0.537ct loose
Sold out オレゴンサンストーン 0.663ctルース

Oregon Sunstone 0.663ct loose
Sold out オーストラリア産ボルダーオパール 0.721ctルース

Australian boulder opal 0.721ct loose
Sold out アフガニスタン産クンツァイト 3.340ctルース

[10/11 22:00 Sale] Afghanistan Kunzite 3.340ct Loose Stone
Sold out モザンビーク産アルマンディンガーネット 6.3mm/1.037ctルース

[On Sale at 10:00 PM on October 13th] Mozambique Almandine Garnet 6.3mm/1.037ct Loose Stone
Sold out マダガスカル産ブルーサファイア 0.338ctルース

[10/11 22:00 Sale] Madagascar Blue Sapphire 0.338ct Loose
Sold out パープルダイヤモンド（トリートメント） 2.6mm/0.088ctルース（バイカラー蛍光）

[On Sale 10/11 at 10 PM] Purple Diamond (Treated) 2.6mm/0.088ct Loose (Bicolor Fluorescent)
Sold out ブラジル産エレスチャルアメジスト 1.058ctルース

[On Sale at 10 PM on September 28th] Brazilian Elestial Amethyst 1.058ct Loose Stone
Sold out ノンオイルレッドベリル 0.200ctルース GIA

[On sale at 10pm on September 28th] Oil-free red beryl 0.200ct loose GIA
Sold out アメリカ産ネプチュナイト 0.143ctルース

[On Sale at 10 PM on September 28th] American Neptunite 0.143ct Loose Stone
Sold out Limited to 14 stones: 1 loose sphalerite stone from Spain (average 0.55 carats) Multiple purchase discounts available

Limited to 14 stones: 1 loose sphalerite stone from Spain (average 0.55 carats) Multiple purchase discounts available
Sold out [Available at 10 PM on September 26th] Limited to 1 set: Benitoite Gradient Set of 6 (2.0mm Round Cut, Top Quality) Loose Stones

[Available at 10 PM on September 26th] Limited to 1 set: Benitoite Gradient Set of 6 (2.0mm Round Cut, Top Quality) Loose Stones
Sold out ブラジル産レピドクロサイトインクォーツ 2.223ctルース

Brazilian lepidocrocite in quartz 2.223ct loose
coming soon [Posted in 32501467] Brown Diamond (Treatment) 0.169ct Loose (FANCY RED BROWN, VS2)

[Posted in 32501467] Brown Diamond (Treatment) 0.169ct Loose (FANCY RED BROWN, VS2) Sale price¥39,800
Sold out 【12541077掲載】エメラルド 67.796ct原石

[On sale at 10pm on August 7th] 67.796ct rough emerald

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.