5 major gems

K18WG ブルーサファイアダイヤモンド0.051ctペンダントトップ（ネックレストップ）鑑別書

[22602720 listed] [Colorfury] K18WG Blue Sapphire Diamond 0.051ct Pendant Top (Necklace Top) with certificate Sale price¥39,800

Pt900 アレキサンドライト 0.33ct ダイヤモンド0.11ct Xモチーフペンダントトップ（ネックレストップ）鑑別書

[Item #22602717] [Colorful] Pt900 Alexandrite 0.33ct Diamond 0.11ct Pendant Top (Necklace Top) with certificate Sale price¥128,000

【Available 9/23 at 10 PM】《Limited to 6 stones》Rough Colombian Emerald (avg. 0.75ct) 《Multi-buy discount available》 Sale price¥9,800

K18 ロシア産デマントイドガーネット（ホーステール認む） 3.5mm/0.155ct ダイヤモンド0.04ctリング鑑別書

[Available 9/25, 10:00 PM] [Coloriful] K18 Russian Demantoid Garnet (Horsetail inclusion verified) 3.5mm/0.155ct, Diamond 0.04ct Ring with Identification Report Sale price¥128,000

[On sale 9/25 at 22:00] [Color-free] Pt900 Royal Blue Sapphire 0.84ct Ring with Identification Report Sale price¥148,000

【Calafuri】Pt900 Ice Blue Diamond (Treated) 1.00ct Ring Sale price¥158,000

[Available 9/22, 10 PM] Unheated Pigeon Blood Ruby 0.310ct Loose AIGS Sale price¥49,800

[On sale 9/23 at 22:00] <4 stones only> Brazilian moss green beryl loose stone (emerald cut, avg. 1.2ct) <multi-buy discount available></multi-buy>

[On sale 9/23 at 22:00] <4 stones only> Brazilian moss green beryl loose stone (emerald cut, avg. 1.2ct) Sale price¥3,980

[On sale 9/20 at 22:00] [Color-free] Pt950 Red Beryl 0.20ct / Diamond 0.23ct Ring with Appraisal Report Sale price¥98,000

【Available 9/20 at 10:00 PM】 Colorfuli K18 Aquamarine 0.65ct & Diamond 0.02ct Ring with Identification Card Sale price¥89,800

[On Sale 9/20 at 10 PM] [Colori] K18WG 0.09ct Diamond Treble Clef Motif Pendant Top (Necklace Top) Sale price¥39,800

[#202607 Akihabara Pop-up Store Takeout][Shinjuku Marui Annex 202605 Takeout][12548265 Listed] Padparadscha Sapphire 0.545ct Loose Stone Sale price¥69,800

[Available 9/22, 10 PM] Colombian Emerald 0.150ct Loose Stone Sale price¥12,800

K18WG マルチカラーサファイア0.83ct・ダイヤモンド0.70ct 3WAYクロスペンダント（ネックレス）鑑別書

[Available 9/25, 10 PM] [Color-free] K18WG Multicolor Sapphire 0.83ct / Diamond 0.70ct 3-Way Cross Pendant (Necklace) with Appraisal Report Sale price¥198,000

Pt900 ティールグリーンサファイア 0.46ct ダイヤモンド0.10ctリング鑑別書

[Available 9/24 10:00 PM] [Colori] Pt900 Teal Green Sapphire 0.46ct Diamond 0.10ct Ring with Appraisal Report Sale price¥89,800

Pt900 エメラルド 0.4ct ダイヤモンド0.33ctペンダントトップ（ネックレストップ）鑑別書

[Available 9/24 at 10 PM] [Colori] Pt900 Emerald 0.40ct & Diamond 0.33ct Pendant Top (Necklace Top) with Appraisal Report Sale price¥79,800

Pt900 トルマリンキャッツアイ 4.598ct ダイヤモンド0.20ctリング中央宝石研究所ソーティング

[Available 9/18 at 10:00 PM] [Coloriful] Pt900 Tourmaline Cat's Eye 4.598ct Diamond 0.20ct Ring Sale price¥98,000

Pt900/Pt850 ピンクダイヤモンド 0.03ct・ダイヤモンド0.30ctペンダント（ネックレス）ミニ鑑別カード

[On sale 9/24 at 10 PM] [Colori] Pt900/Pt850 Pink Diamond 0.03ct & Diamond 0.30ct Pendant (Necklace) with Mini Identification Card Sale price¥79,800

Pt900 エメラルド 5.33ct サファイア4.52ct、ダイヤモンド0.12ctリング宝貴協

[On sale 9/24 at 22:00] [Colorfully] Pt900 Emerald 5.33ct, Sapphire 4.52ct, Diamond 0.12ct Ring (JGA Certified) Sale price¥198,000

【Available 9/18, 10:00 PM】 Thai Black Star Sapphire 7.437ct Loose Gemstone Sale price¥19,800

[On sale 9/26 at 22:00] Mexican Cantera Opal 9.166ct loose gemstone Sale price¥29,800

[Available 9/19 at 10 PM] Mexican Cantera Opal 24.256ct Loose Stone Sale price¥69,800

[Available 9/19 at 10 PM] Colombian Emerald with Pyrite, 0.634ct Raw Gemstone Sale price¥19,800

[On sale 9/19 at 22:00] Colombian Emerald with Pyrite, 0.981ct Raw Gemstone Sale price¥29,800

[Available 9/19 at 10:00 PM] 1.645ct Colombian Emerald Rough Stone Sale price¥49,800

【Available 9/22, 10:00 PM】 Colombian Emerald 0.078ct Loose Gemstone Sale price¥18,800

[9/23 10 PM Sale] Mexican Fire Opal 0.824ct Loose Gemstone Sale price¥12,800

[Available 9/24 at 10 PM] Australian Black Opal 0.322ct Loose Gemstone Sale price¥16,800

【9/20 22:00 Release】 Madagascar Padparadscha Sapphire 3.6mm/0.281ct Loose Stone, DGL Certified Sale price¥35,800

[Available Sept. 21, 10:00 PM] Colombian Emerald 0.267ct Loose Gemstone Sale price¥39,800

[Available 9/21, 10:00 PM] Colombian Emerald 0.152ct Loose Gemstone Sale price¥25,800

[Available Sept 21, 10 PM] Brazilian Mint Color Emerald 0.451ct Loose Stone Sale price¥15,800

[On sale 9/21 at 22:00] Ruby 0.176ct Loose Stone Sale price¥15,800

Diamond 0.128ct loose stone (cabochon cut, maroon cut) Sale price¥45,800

Colombian pyrite-mica emerald 0.628ct loose stone Sale price¥29,800

Colombian emerald 0.231ct loose stone Sale price¥25,800

American Herkimer Diamond 5.6mm/0.516ct Loose Sale price¥8,800

Colombian Trapiche Emerald 0.299ct Loose Sale price¥16,800

Sri Lankan glass body (sapphire crystal) 7.983ct rough stone Sale price¥19,800

Sri Lankan glass body (sapphire crystal) 9.933ct rough stone Sale price¥29,800

Sri Lankan glass body (sapphire crystal) 10.140ct rough stone Sale price¥22,800

[#202607 Akihabara Popup Out for Sale] [Lottery Sale 12] [For Winners Only] [12562560 Listed] Unheated Montana Sapphire (Yogo Origin) 0.159ct Loose with Certificate Sale price¥98,000

K18YG ブラジル産パライバトルマリン 0.066ct ダイヤモンド0.091ctペンダント（ネックレス）ソーティング

[Lottery Sale 0829] K18YG Brazilian Paraiba Tourmaline 0.066ct Diamond 0.091ct Pendant (Necklace) with Sorting Sale price¥158,000

K18YG タンザニア産アルマンディンガーネット 1.003ct・ピンクサファイアリング

[Available 9/13, 10:00 PM] 18K Yellow Gold Tanzanian Almandine Garnet 1.003ct & Pink Sapphire Ring Sale price¥89,800

Pt900 スリランカ産ブルーサファイア0.465ct ダイヤモンド0.28ctリング鑑別書

[On sale 9/13, 10 PM] Pt900 Sri Lankan Blue Sapphire 0.465ct Diamond 0.28ct Ring with Identification Report Sale price¥118,000

[Available 9/12, 10:00 PM] Colombian Emerald 0.247ct Loose Gemstone Sale price¥39,800

イエローダイヤモンド 0.285ctルース(UNDER N(VERY LIGHT YELLOW), VS-1)

[Available 9/12 at 10:00 PM] Yellow Diamond 0.285ct Loose Stone (VERY LIGHT YELLOW, VS-1) Sale price¥55,800

[Available 9/11 at 10:00 PM] Mexican Fire Opal (faceted cut) 1.255ct loose stone Sale price¥49,800

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.