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coming soon スフェーン 4.3mm/0.275ctルース

Sphane 4.3mm/0.275ct loose Sale price¥3,980
coming soon ブラックスターサファイア 1.410ctルース

Black Star Sapphire 1.410ct loose Sale price¥14,800
coming soon イエローダイヤモンド2.6mmルース（VSクラス相当）

Yellow diamond 2.6mm loose (equivalent to VS class) Sale price¥12,800
coming soon 【12556504掲載】ロッククリスタル 8.455ctルース

Lottery Sale 0908⑦_ [Takeshi Yamamoto] Rock Crystal 8.455ct Loose Stone Sale price¥39,800
Sold out ジルコン 2.219ctルース（結晶入り） 日独鑑

Zircon 2.219ct loose (with crystals) Japanese-German edition
coming soon [On Sale 10/12 at 10 PM] [Limited to 10 stones] Unheated Sapphire (3.5mm, Round Cut) from Theppanawa Mine, Sri Lanka (Loose) [Multiple Purchase Discounts Available]

[On Sale 10/12 at 10 PM] [Limited to 10 stones] Unheated Sapphire (3.5mm, Round Cut) from Theppanawa Mine, Sri Lanka (Loose) [Multiple Purchase Discounts Available] Sale price¥4,980
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） 0.321ctルース

[10/11 22:00] Rainbow Garnet from Tenkawa Village, Nara Prefecture, 3.9mm/0.321ct Loose Stone (Rose Cut) Sale price¥8,800
coming soon ブラジル産パライバトルマリン 0.065ctルース （CuO:2.0%、MnO:2.6%）

Brazilian Paraiba tourmaline 0.065ct loose (CuO:2.0%, MnO:2.6%) Sale price¥22,800
Sold out タンザナイト 2.358ctルース

Tanzanite 2.358ct loose
coming soon Lottery Sale 092109_Brazilian Blue Anatase 0.424ct Loose Stone

Lottery Sale 092109_Brazilian Blue Anatase 0.424ct Loose Stone Sale price¥69,800
coming soon 【12560395掲載】YAG（イットリウムアルミニウムガーネット） 1.391ctルース

Lottery Sale 092101_ [Yukinko Cut] YAG (Yttrium Aluminum Garnet) 1.391ct Loose Stone with Certificate of Authenticity Sale price¥39,800
coming soon 【12560397掲載】YAG（イットリウムアルミニウムガーネット） 1.480ctルース

Lottery Sale 092103_ [Star-in Cut] YAG (Yttrium Aluminum Garnet) 1.480ct Loose Stone with Certificate of Authenticity Sale price¥39,800
coming soon 【12560394掲載】YAG（イットリウムアルミニウムガーネット） 2.026ctルース

Lottery Sale 092102_ [Sakura Shape] YAG (Yttrium Aluminum Garnet) 2.026ct Loose Stone with Certificate of Authenticity Sale price¥39,800
coming soon バイカラーサファイア 0.292ctルース

Bicolor sapphire 0.292ct loose Sale price¥22,800
coming soon 【サンジェ氏】YAG（イットリウムアルミニウムガーネット） 6.5mm/1.548ctルース - カラッツSTORE

YAG (Yttrium Aluminum Garnet) 6.5mm/1.548ct loose stone Sale price¥12,800
coming soon 非加熱ブラジル産パライバトルマリン 0.30ctルース GIA

Unheated Brazilian Color Change Paraiba Tourmaline 0.30ct Loose GIA Sale price¥1,280,000
Sold out [On Sale 10/11 at 10 PM] [Limited to 18 stones] Brazilian Paraiba Tourmaline (Cabochon Cut, Approx. 2.2mm) Loose Stone [Multiple Purchase Discounts Available]

[On Sale 10/11 at 10 PM] [Limited to 18 stones] Brazilian Paraiba Tourmaline (Cabochon Cut, Approx. 2.2mm) Loose Stone [Multiple Purchase Discounts Available]
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 Brazilian alexandrite 0.066ct loose (Hemachita mine)

Brazilian alexandrite 0.066ct loose (Hemachita mine)
[10/11 22:00 Sale] Afghanistan Kunzite 3.340ct Loose Stone

[10/11 22:00 Sale] Afghanistan Kunzite 3.340ct Loose Stone Sale price¥9,800
[10/11 22:00 Sale] Indian Moonstone 1.046ct Loose

[10/11 22:00 Sale] Indian Moonstone 1.046ct Loose Sale price¥9,800
[10/11 22:00 Sale] Mexican Cantera Opal 14.690ct Loose

[10/11 22:00 Sale] Mexican Cantera Opal 14.690ct Loose Sale price¥12,800
coming soon ロシア産エメラルド 0.282ctルース

[On Sale at 10 PM on October 12th] Russian Emerald 0.282ct Loose Stone (F1, Minor Enhancement) GIA Sale price¥128,000
coming soon ロシア産エメラルド 0.387ctルース

[On Sale at 10 PM on October 12th] Russian Emerald 0.387ct Loose Stone (F1, Minor Enhancement) GIA Sale price¥128,000
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]
[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] Sale price¥3,980
coming soon [Available at 10/12 22:00] 18K Yellow Gold Brazilian Santa Maria Aquamarine 0.284ct Pendant (Necklace)

[Available at 10/12 22:00] 18K Yellow Gold Brazilian Santa Maria Aquamarine 0.284ct Pendant (Necklace) Sale price¥49,800
K18YG ミャンマー産翡翠（ヒスイ） 0.434ct・エメラルドリング

[On sale from 10/11 at 10 PM] 18K Yellow Gold Myanmar Jadeite and Emerald 0.434ct Ring Sale price¥79,800
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
coming soon 【22602491掲載】K18YG オレゴンサンストーン 0.44ct リング

18K Yellow Gold American Oregon Sunstone 0.44ct, Pink Diamond, Orange Spinel Ring Sale price¥158,000
coming soon [10/12 22:00 Sale] Pigeon Blood Ruby 0.320ct Loose Stone AIGS

[10/12 22:00 Sale] Pigeon Blood Ruby 0.320ct Loose Stone AIGS Sale price¥48,800
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 Sale price¥69,800
coming soon ブラジル産ルベライト 2.588ctルース

[10/12 22:00 Sale] Brazilian Rubellite 2.588ct Loose Stone Sale price¥69,800
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 Sale price¥9,800
[On Sale 10/11 at 10 PM] Brazilian Paraiba Tourmaline 0.170ct Loose Stone (CuO: 2.1%, MnO: 1.1%)

[On Sale 10/11 at 10 PM] Brazilian Paraiba Tourmaline 0.170ct Loose Stone (CuO: 2.1%, MnO: 1.1%) Sale price¥198,000
[10/11 22:00 Sale] Madagascar Iolite 0.707ct Loose Stone

[10/11 22:00 Sale] Madagascar Iolite 0.707ct Loose Stone Sale price¥12,800
coming soon [10/12 22:00 Sale] Brazilian Paraiba Tourmaline 0.052ct Loose Stone

[10/12 22:00 Sale] Brazilian Paraiba Tourmaline 0.052ct Loose Stone Sale price¥29,800
coming soon [10/12 22:00 Sale] Sri Lankan Star Sapphire 1.093ct Loose

[10/12 22:00 Sale] Sri Lankan Star Sapphire 1.093ct Loose Sale price¥8,800
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
coming soon [10/12 22:00 Sale] Brazilian Unheated Pink Imperial Topaz (Sherry Pink) 0.231ct Loose

[10/12 22:00 Sale] Brazilian Unheated Pink Imperial Topaz (Sherry Pink) 0.231ct Loose Sale price¥18,800
coming soon キャシテライト 0.676ctルース

[10/12 22:00 Sale] Cassiterite 4.2mm/0.676ct Loose Stone with Certificate of Authenticity Sale price¥16,800
coming soon 【12560215掲載】ピジョンブラッドルビー 0.230ctルース

[10/12 22:00 Sale] Pigeon Blood Ruby 3.7mm/0.230ct Loose Stone AIGS Sale price¥39,800
coming soon [10/12 22:00 Sale] Pakistani Veirinite 0.145ct Loose Stone with Certificate of Authenticity

[10/12 22:00 Sale] Pakistani Veirinite 0.145ct Loose Stone with Certificate of Authenticity Sale price¥36,800
coming soon [10/12 22:00 Sale] Unheated Royal Blue Sapphire 0.640ct Loose AIGS

[10/12 22:00 Sale] Unheated Royal Blue Sapphire 0.640ct Loose AIGS Sale price¥158,000
coming soon ラボグロウンダイヤモンド（合成ダイヤモンド） 0.290ctルース(FANCY VIVID PINK, VS-2)

[On Sale at 10 PM on October 12th] Lab-Grown Diamond (Synthetic Diamond) 0.290ct Loose (FANCY VIVID PINK, VS-2) Sale price¥45,800
coming soon 【10/12 22時販売】《限定10石》ブルー石ガチャ（ブラジル産パライバトルマリン0.088ct、ジンバブエ産ユークレース、コバルトガーナイト）《複数購入割引有》

【10/12 22時販売】《限定10石》ブルー石ガチャ（ブラジル産パライバトルマリン0.088ct、ジンバブエ産ユークレース、コバルトガーナイト）《複数購入割引有》 Sale price¥7,980
coming soon 【9/12 22時販売】《限定7石》ロシア産ノンオイルエメラルド1石ルース(1.5-1.6ｍｍ,ステップカット)《複数購入割引有》

【9/12 22時販売】《限定7石》ロシア産ノンオイルエメラルド1石ルース(1.5-1.6ｍｍ,ステップカット)《複数購入割引有》 Sale price¥5,980
coming soon [Available at 10:00 PM on December 10, 2025] Adult Sebon Star Pendant Silver Model (SV925)

[Available at 10:00 PM on December 10, 2025] Adult Sebon Star Pendant Silver Model (SV925) Sale price¥29,800

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.