¥30,000 - ¥50,000

Paraiba Tourmaline from Brazil 0.067 ct loose (CuO: 1.4%, MnO: 2.4%) Sale price¥39,800

Brazilian Paraiba Tourmaline 0.821ct rough stone Sale price¥39,800

ブラジル産パライバトルマリン 0.239ctルース（CuO:1.0%、MnO:3.9%）

Brazilian Alexandrite 0.239ct Loose Gemstone [Listed as 12564071] Sale price¥45,800

非加熱ブラジル産パライバトルマリン 0.079ctルース（CuO:1.8%、MnO:2.6%）

Unheated Brazilian Paraiba Tourmaline 0.079ct loose stone (CuO: 1.8%, MnO: 2.6%) Sale price¥45,800

Brazilian pink tourmaline 1.458ct loose stone Sale price¥39,800

Brazilian Tourmaline (untreated) 5.120ct loose stone Sale price¥39,800

[Published on 12563859] Australian black opal, 1.184ct loose stone Sale price¥45,800

Pakistani Clinohumite 1.440ct Loose Stone, Japan-Germany Exchange Sale price¥39,800

[On sale 9/1 at 22:00] Pigeon Blood Ruby 0.350ct Loose Stone AIGS Sale price¥49,800

[Available 9/2 at 10 PM] Mahenge Spinel (Pink Spinel) from Tanzania, 0.366ct Loose Stone, with Identification Report Sale price¥39,800

【Available 9/3 at 10:00 PM】 Sri Lankan Purple Sapphire 0.376ct Loose Stone with Appraisal Report Sale price¥35,800

[Posted as 12563267] Rough Botswana Diamond (Sawable) 0.140ct Sale price¥44,800

[Updated 12546024] Ametrine 4.206ct loose Sale price¥39,800

[On sale 8/23 at 10 PM JST] Sri Lankan Yellow Sapphire 1.100ct Loose Stone, Japan/Germany certified Sale price¥49,800

【Sales start 8/22 10 PM JST】Bicolor Grossular Garnet from Kenya 0.906ct Loose Stone Sale price¥39,800

[Posted on 12563358] Jeremejevite from Namibia 0.150ct Loose Sale price¥37,800

[Published as 12563385] Tanzanian Zircon 3.964ct Loose Sale price¥39,800

【12563732 Posted】Tanzanian Red Spinel 0.177ct Loose Sale price¥35,800

[Featured on 12563911] Colombian Pyrite and Mica in Emerald, 0.409ct Loose Gemstone Sale price¥32,800

[Sale on August 23rd at 10 PM] Moldavite from former Czechoslovakia 9.1mm/2.296ct Loose Stone with Certificate Sale price¥32,800

[Available 8/28 at 10 PM] Tanzanian Blue Spinel 1.154ct Loose Stone with Gem Identification Report Sale price¥39,800

[Available 8/28 at 10 PM] Tanzanian Blue Spinel 1.117ct Loose Gemstone with Identification Report Sale price¥39,800

[Listed as 12563729] Brazilian Indicolite Tourmaline 0.389ct Loose Sale price¥38,800

[Listed as 12563733] Tanzania Red Spinel 0.241ct Loose Stone Sale price¥43,800

[Listed as 12563903] Tanzanian Bicolor Zoisite 1.382ct Loose Stone Sale price¥45,800

Brazilian Euclase (Bicolor Euclase) 0.302ct Loose Stone Sale price¥45,800

[Lottery Sale ②_202608_16] Loose Brazilian Parti-Color Tourmaline 15.355ct Sale price¥39,800

[12558559] Zimbabwe bicolor euclase rough stone 0.744ct Sale price¥39,800

コロンビア産パイライト・雲母インエメラルド 5.5mm/0.614ctルース鑑別書

[Published on 12563914] Loose Colombian Pyrite and Mica in Emerald, 0.614 ct Sale price¥45,800

Brazilian bicolor tourmaline 7.489ct loose Sale price¥39,800

ファンシーディープイエローダイヤモンド 3.6mm/0.190ルース(FANCY DEEP ORANGY YELLOW, SI2)

【#202607AkihabaraPopUpTakeOut】90002505NewYearLuckyBag2025_【On sale Dec 14, 10 PM JST】Fancy Deep Yellow Diamond 3.6mm/0.190ct Loose (FANCY DEEP ORANGY YELLOW, SI2) Sale price¥39,800

[#202607 Akihabara Pop-up Store - Currently Removed from Stock] [12563475 Posted] Mahenge Spinel (Pink Spinel) from Tanzania 0.492ct Loose Stone Sale price¥49,800

コロンビア産パイライト・雲母インエメラルド 5.0mm/0.500ctルース鑑別書

[12563912 listed] Colombian Pyrite and Mica in Emerald 0.500ct Loose Stone Sale price¥39,800

diamond Sale price¥45,800

【#202607 Akihabara Popup Outtake】【12562793 Listed】Unheated Brazilian Imperial Topaz (Sherry Color) 0.459ct Loose Stone Sale price¥32,800

[#202607 Akihabara Pop-up Store - Currently out on loan] [Listed as 12563392] Tanzanian Red Spinel 0.291ct Loose Stone Sale price¥35,800

[#202607 Akihabara Pop-up Store - Currently Removed] [Shinjuku Marui Annex 202605 - Currently Removed] [12559525 Listed] Synthetic Alexandrite 1.409ct Loose Stone Sale price¥39,800

[#202607 Akihabara Pop-up Out of Office] [12562592 Listed] Scheelite from Sichuan, China, 1.138ct Loose Stone Sale price¥39,800

[On sale August 9, 10 PM] Untreated Purple-Pink Imperial Topaz, 0.250 ct Loose Stone, with Certificate, from Brazil Sale price¥39,800

[On sale August 19th, 10 PM JST] Untreated Purple-Pink Imperial Topaz from Brazil, 0.241ct loose stone with gemological report Sale price¥35,800

[On sale August 19th at 10 PM] Colombian Pyrite and Mica in Emerald 5.5mm/0.617ct Loose Stone with Certification Sale price¥45,800

[On Sale August 16, 10 PM] Burmese Red Spinel 0.236ct Loose Stone with Certificate Sale price¥45,800

[Listed on 12562258] Eudialyte from Canada 2.796 ct loose stone Sale price¥39,800

[On sale August 1, 10 PM] Colombian Cosquez Trapiche Emerald 0.252ct Loose Stone with Certificate Sale price¥35,800

[On sale August 1, 10 PM JST] Colombian Cosquez Trapiche Emerald, 0.231 ct, Loose Stone with Certificate Sale price¥33,800

1.025ct Loose White Sapphire from Sri Lanka with Gemological Report Sale price¥35,800

ピンクダイヤモンド 2.2mm/0.044ctルース(FANCY LIGHT PURPLE PINK, SI1)

Pink Diamond 2.2mm/0.044ct Loose Stone (FANCY LIGHT PURPLE PINK, SI-1) Sale price¥39,800

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.