Round Cut

[12/17 22:00 Sale] Russian Demantoid Garnet (Horsetail Certified) 4.2mm/0.325ct Loose Stone Sale price¥59,800

[On Sale at 10 PM on December 6th] Indonesian Parasitic Peridot 3.8mm/0.267ct Loose Stone Sale price¥128,000

[12/14 22:00] American Peridot 5.1mm/0.573ct Loose Stone Sale price¥9,800

[12/12 22:00 Sale] Mali Garnet (Grossular/Andradite Garnet) 0.741ct Loose Stone from the Republic of Mali with Certificate of Authenticity Sale price¥25,800

[12/14 22:00] Colombian Emerald 3.0mm/0.098ct Loose Stone Sale price¥12,800

[12/5 22:00] Russian Phenakite 6.6mm/1.058ct Loose Stone Sale price¥39,800

[12/21 22:00] Rainbow Garnet (Andradite Garnet) 7.0mm/2.135ct Loose Stone from Tenkawa Village, Nara Prefecture Sale price¥12,800

[On Sale at 10 PM on December 21st] Madagascar Bicolor Sapphire 5.8mm/1.006ct Loose Sale price¥12,800

[12/9 22:00 Sale] Internally Flawless Diamond (H&C) 3.8mm/0.210ct Loose (F, IF, 3 Excellent H&C) GIA & Chuho Sale price¥69,800

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

[Shinjuku Marui Annex 202511] [12/5 22:00] Internally Flawless Diamond (H&C) 4.45mm/0.305ct Loose (F, IF, 3 Excellent H&C) Sale price¥98,000

【さくらインカット】マダガスカル産アパタイト 7.9mm/1.537ct《コラボ》ルースワッペン

[Sale starts at 10 PM on December 5th] [Sakura In-Cut] Madagascar Green Apatite 7.9mm/1.537ct [Collaboration] Loose Stone with Patch Sale price¥45,800

[12/15 22:00] Tanzanian Almandine Garnet 6.4mm/1.271ct Loose Stone Sale price¥12,800

[11/18 22:00 Sale] Russian Demantoid Garnet (Horsetail Certified) 3.8mm/0.249ct Loose Stone Sale price¥39,800

[On Sale at 10 PM on November 16th] Oil-Free Red Beryl from the United States, 2.5mm/0.050ct Loose, GIA Sale price¥59,800

[Shinjuku Marui Annex 202511] [11/10 22:00] Mozambique Ruby 3.4mm/0.139ct Loose Sale price¥25,800

[12/15 22:00] Tanzanian Almandine Garnet 11.0mm/6.787ct Loose Stone Sale price¥49,800

[On Sale 11/20 at 10 PM] Russian Demantoid Garnet (Horsetail Certified) 3.3mm/0.162ct Loose Stone Sale price¥39,800

[On Sale 11/3 at 10pm] Afghanistan Green Tourmaline 7.8mm/1.738ct Loose Stone Sale price¥59,800

[11/2 22:00] Pakistani Peridot 5.2mm/0.562ct Loose Stone Sale price¥9,800

[On Sale 11/2 at 10pm] Zimbabwean Sphene 4.7mm/0.400ct Loose Stone Sale price¥9,800

[11/1 22:00 Sale] Tibetan Andesine 0.738ct Loose Stone Sale price¥15,800

[Shinjuku Marui Annex 202511] [On Sale 11/3 10pm] Unheated Ruby 4.5mm/0.430ct Loose GIT Sale price¥98,000

[11/14 22:00 Sale] Oregon Sunstone from the United States, 6.0mm/0.754ct Loose Stone Sale price¥18,800

[11/14 22:00] Brazilian Rubellite 5.4mm/0.595ct Loose Stone Sale price¥9,800

[On Sale 11/23 10pm] Tanzanite from Tanzania 7.4mm/1.747ct Loose Stone Sale price¥59,800

[On Sale 11/7 at 10pm] Madagascar Apatite 6.0mm/0.901ct Loose Stone Sale price¥9,800

Brazilian citrine 5.4mm/0.769ct loose stone Sale price¥6,980

ロシア産デマントイドガーネット（ホーステール認む） 3.8mm/0.280ctルース

Russian Demantoid Garnet (Horsetail) 3.8mm/0.280ct Loose Stone Sale price¥49,800

[On Sale 11/23 10pm] Greenland Ruby 0.360ct Loose Stone with Certificate Sale price¥69,800

Russian Alexandrite 2.8mm/0.111ct Loose Stone Sale price¥69,800

Russian Alexandrite 2/5mm/0.070ct Loose Stone Sale price¥59,800

[11/1 22:00 Sale] Brazilian London Blue Topaz 1.281ct Loose Sale price¥12,800

[11/13 22:00 Sale] Rhodolite Garnet 5.3mm/0.703ct Loose Stone Sale price¥12,800

Indian Iolite Sunstone 0.228ct Loose Stone Sale price¥6,980

Brazilian Rutile Quartz (Rutile-Rated Quartz) 12mm/5.333ct Loose Stone Sale price¥9,800

Russian Demantoid Garnet (Horsetail) 3.8mm/0.255ct Loose Stone Sale price¥39,800

Brazilian Blue Topaz 5.5mm/0.754ct Loose Stone Sale price¥5,980

Cassiterite 4.2mm/0.676ct Loose Stone with Certificate of Authenticity Sale price¥16,800

[Shinjuku Marui Annex 202511] Pigeon Blood Ruby 4.0mm/0.290ct Loose AIGS Sale price¥59,800

[Shinjuku Marui Annex 202511] Russian Demantoid Garnet (Horsetail Certified) 2.5mm/0.079ct Loose Stone Sale price¥12,800

Russian Demantoid Garnet (Horsetail) 2.5mm/0.075ct Loose Stone Sale price¥12,800

ロシア産デマントイドガーネット（ホーステール認む） 2.5mm/0.073ctルース

Russian Demantoid Garnet (Horsetail) 2.5mm/0.073ct Loose Stone Sale price¥14,800

[11/10 22:00 Sale] Russian Demantoid Garnet (Horsetail Certified) 3.1mm/0.128ct Loose Stone Sale price¥39,800

Greenland Ruby 3.6mm/0.220ct Loose Stone with Certificate Sale price¥39,800

Greenland Ruby 3.6mm/0.210ct Loose Stone with Certificate Sale price¥45,800

Greenland Ruby 3.0mm/0.134ct Loose Stone with Certificate Sale price¥25,800

Mozambique Almandine Garnet 7.7mm/1.781ct Loose Stone Sale price¥18,800

[Shinjuku Marui Annex 202511] Tanzanian Dragon Garnet 5.0mm/0.767ct Loose Stone Sale price¥19,800

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.