Round Cut

【4/11 22時販売】ブラウンダイヤモンド 0.989ct（FANCY DARK ORANGE Brown /SI-2）ルース Sale price¥98,000

【4/10 22時販売】ブラジル産アレキサンドライト 2.7mm/0.105ctルース Sale price¥29,800

【4/11 22時販売】アメリカ産ベニトアイト 3.4mm/0.175ctルース Sale price¥98,000

【12555695掲載】ブラジル産パライバトルマリンインクォーツ 0.313ctルース

【12555695 listed】Brazilian Paraiba Tourmaline in Quartz 0.313ct Loose Stone Sale price¥15,800

【ダンデライオンカット】モンゴル産カラーチェンジアンデシン 6.0mm/0.774ctルース

[Sales start 4/5 10:00 PM JST] [Dandelion Cut] Mongolian Color Change Andesine 6.0mm/0.774ct Loose Stone Sale price¥49,800

フローレスダイヤモンド（H&C） 0.266ctルース(D, FL, 3Excellent H&C)

[Shinjuku Marui Removal 20260319] New Year Lucky Bag 2026 Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3Excellent H&C) GIA & CBT Sale price¥188,000

【On Sale April 4 at 10 PM】Brazilian Morganite 11mm/5.181ct Loose Stone Sale price¥158,000

[On Sale April 4th at 10 PM] Brazilian Morganite 10mm/4.535ct Loose Stone Sale price¥148,000

【On sale at 10 PM, April 3rd】Russian Demantoid Garnet (horsetail inclusion visible) 3.8mm/0.265ct Loose Stone Sale price¥29,800

[12560352] Zimbabwean Euclase 0.397ct Loose Stone Sale price¥98,000

ロシア産デマントイドガーネットキャッツアイ（ホーステール認む） 0.194ctルース

Russian Demantoid Garnet (Horsetail) 2.9mm/0.194ct Loose Stone Sale price¥22,800

[Sale on April 3rd at 10 PM] Bulgarian Sphalerite 7.6mm/2.233ct Loose Stone Sale price¥69,800

Nepalese Bicolor Kyanite 6.3mm/0.903ct Loose Stone Sale price¥9,800

Mica in Quartz 0.760ct Loose Sale price¥5,980

Mica in Quartz 0.588ct Loose Stone Sale price¥5,980

[Dandelion cut] Rhodochrosite from South Africa 2.244ct loose with emblem Japanese-German edition Sale price¥298,000

Mexican bicolor Danburite 1.932ct loose stone by Nikkei Sale price¥29,800

[On Sale March 19th at 10 PM] American Oregon Sunstone 7.0mm/1.494ct Loose Stone Sale price¥35,800

[On Sale 3/12 10pm] Oregon Sunstone from the USA, 6.1mm/0.820ct Loose Sale price¥16,800

[On sale March 17 at 10 PM] U.S. Oregon Sunstone 7.0mm/1.356ct Loose Stone Sale price¥35,800

[On Sale 3/24 at 10 PM] US Oregon Sunstone 7.1mm/1.366ct Loose Sale price¥27,800

[On Sale at 10 PM on March 7th] Synthetic Alexandrite 4.3mm/0.430ct Loose Stone Sale price¥12,800

Auinite 2.3mm/0.060ct loose Sale price¥6,980

Auinite 2.6mm/0.084ct loose Sale price¥8,800

Auinite 2.4mm/0.064ct loose Sale price¥8,800

[On Sale 3/13 at 10pm] Canadian Eudialite 2.5mm/0.051ct Loose Stone with Certificate of Authenticity Sale price¥18,800

[On sale March 20th at 10 PM] Canadian Eudialyte 2.5mm/0.047ct Loose Gemstone with Certificate of Authenticity Sale price¥15,800

[On Sale 2/27 10pm] Spanish Sphalerite 6.7mm/1.468ct Loose Stone Sale price¥25,800

[On Sale 3/3 at 10pm] Spanish Sphalerite 7.1mm/1.708ct Loose Stone Sale price¥29,800

[On Sale 3/4 at 10pm] Spanish Sphalerite 5.6mm/0.920ct Loose Stone Sale price¥16,800

【12562006掲載】スペイン産バイカラースファレライト 1.496ctルース

[On Sale at 10 PM on March 5th] Bicolor Sphalerite from Spain, 6.6mm/1.496ct Loose Stone Sale price¥25,800

[On Sale 3/5 at 10pm] Spanish Sphalerite 5.7mm/0.903ct Loose Stone Sale price¥16,800

[On Sale 2/23 at 10 PM] Russian Demantoid Garnet (Horsetail Certified) 5.8mm/0.851ct Loose Stone Sale price¥198,000

[On Sale 2/27 at 10pm] Oregon Sunstone from the USA, 7.0mm/1.260ct Loose Sale price¥12,800

[On Sale 2/21 10pm] Oregon Sunstone from the USA, 7.1mm/1.308ct Loose Sale price¥19,800

[On Sale at 10 PM on March 5th] 1.362ct Oregon Sunstone Loose Stone from the United States Sale price¥15,800

[On Sale 2/21 10pm] American Anthill Garnet 4.0mm/0.359ct Loose Stone Sale price¥12,800

[On Sale 2/21 10pm] American Anthill Garnet 4.0mm/0.332ct Loose Stone Sale price¥11,000

[On sale 3/8 at 10pm] Synthetic Rutile 5.1mm/0.877ct Loose Stone Sale price¥12,800

[On sale March 23rd, 10 PM JST] Synthetic Rutile 1.982ct Loose Stone Sale price¥18,800

【On sale March 22nd at 10 PM JST】Synthetic Rutile 0.554ct Loose Stone Sale price¥8,800

[On Sale at 10 PM on March 8th] Mozambique Almandine Garnet 6.7mm/1.228ct Loose Stone Sale price¥9,800

[On sale April 10, 10 PM JST] Mozambique Almandine Garnet 4.8mm/0.545ct Loose Stone Sale price¥8,800

【Sale starts April 5th at 10 PM JST】Brazilian London Blue Topaz 0.521ct Loose Stone Sale price¥6,980

[On Sale 2/26 10pm] Sri Lankan Hessonite Garnet 6.5mm/1.353ct Loose Stone Sale price¥12,800

[On sale 3/2 at 10pm] Synthetic Rutile 3.9mm/0.329ct Loose Stone Sale price¥9,800

【12561174掲載】メキシコ産ファイアオパール（ファセットカット） 0.517ctルース

[On sale March 24th, 10 PM JST] Mexican Fire Opal (faceted) 5.9mm/0.517ct Loose Sale price¥22,800

German Auyinite 3.5mm/0.131ct Loose Stone 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.