Less than 0.5ct

Tanzania Bicolor Zoisite 4.6mm/0.489ct Loose Stone Sale price¥9,800

Tanzanite from Tanzania 0.497ct loose stone Sale price¥9,800

Tanzania Bicolor Zoisite 4.7mm/0.486ct Loose Stone Sale price¥9,800

Tanzanite from Tanzania 0.245ct loose stone Sale price¥8,800

Tanzania Bicolor Zoisite 0.295ct Loose Stone Sale price¥7,980

Tanzanite from Tanzania 0.385ct loose stone Sale price¥8,800

Tanzania Bicolor Zoisite 0.286ct Loose Stone Sale price¥7,980

Blue sapphire 0.287ct loose Sale price¥12,800

非加熱ブラジル産パライバトルマリン 0.060ctルース（CuO:1.6%、MnO:2.3%）

Brazilian Paraiba Tourmaline 0.060ct Loose (CuO:1.6%, MnO:2.3%) Sale price¥42,800

非加熱ブラジル産パライバトルマリン 0.068ctルース（CuO:1.7%、MnO:2.4%）

Unheated Brazilian Paraiba Tourmaline 0.068ct loose stone (CuO: 1.7%, MnO: 2.4%) Sale price¥45,800

Russian Diamond Rough (Sawable) 0.103ct Loose (Trigon) Sale price¥25,800

Tanzanian Rhodolite Garnet 0.448ct Loose Stone Sale price¥6,980

[On sale 7/4 10 PM] Madagascar Padparadscha Sapphire 0.221ct Loose Stone with Central Gem Lab certificate Sale price¥38,800

【On Sale June 27, 10 PM】Madagascar Padparadscha Sapphire 3.4mm/0.252ct Loose Stone - Central Gem Laboratory Sale price¥45,800

[On sale June 27th, 10 PM JST] Brazilian Lazulite 0.022ct Loose Stone with Certificate Sale price¥18,800

[Sale on 6/27 at 10 PM] Brazilian Lazulite (Lazulite) 0.067ct Loose Stone with Certificate Sale price¥49,800

[Sales start June 30th at 10 PM] Brazilian Lazulite 0.061ct Loose Stone with Gemstone Identification Report Sale price¥45,800

[On Sale June 28th at 10 PM] Afghan Green Hauyne 0.135ct Loose Stone with Certificate Sale price¥35,800

【Sale starts July 6th at 10 PM JST】Madagascar Pezzottaite 0.323ct Loose Stone Sale price¥49,800

[Sale on July 6th at 10 PM] Brazilian Silky Alexandrite Loose Stone 0.265ct with Certificate Sale price¥45,800

[Sale on 7/1 at 10 PM] Tanzanian Pink Spinel 3.9mm/0.246ct Loose Stone with Certification Sale price¥35,800

[On sale July 10th at 10 PM] Zimbabwe Eucrase 0.138ct Loose Gemstone with Certificate Sale price¥29,800

[Sales start July 6, 10 PM] Bicolor Euclase from Zimbabwe 0.118ct Loose Gemstone with Certificate Sale price¥25,800

[On sale June 23 at 10 PM] Untreated Ruby 0.207ct Loose Stone (Houseki Kyo certificate) Sale price¥69,800

YAG (Yttrium Aluminum Garnet) 3.9mm/0.317ct loose stone Sale price¥6,980

YAG (Yttrium Aluminum Garnet) 4.1mm/0.346ct Loose Stone (Rose Cut) Sale price¥8,800

YAG (Yttrium Aluminum Garnet) 3.3mm/0.208ct Loose Stone (Rose Cut) Sale price¥5,980

Nigerian bicolor tourmaline 0.379ct loose stone Sale price¥6,980

Tanzanian green sapphire 0.303ct loose stone Sale price¥8,800

Sri Lankan cobalt spinel 0.281ct loose stone Sale price¥55,800

Colombian mint color emerald 0.297ct loose stone Sale price¥8,800

[Updated 12552163] Benitoite 0.099ct loose stone Sale price¥29,800

Pakistani Oil in Quartz 0.438ct Loose Stone Sale price¥6,980

Madagascar sapphire 0.448ct loose stone Sale price¥15,800

[Sale on June 25th at 10 PM] Zimbabwe Euclase 0.067ct Loose Stone with Certification Sale price¥15,800

[Sale begins June 26th, 10 PM JST] Sri Lankan Silky Sapphire 5.1mm/0.488ct Loose Rose Cut Gemstone Sale price¥7,980

[Sale Date: June 26th, 10 PM JST] Brazilian Medusa Quartz (Paraiba Quartz) 5.4mm/0.479ct Loose Stone (Rose Cut) Sale price¥12,800

[On sale June 23rd at 10 PM] Sierra Leone rough diamond (sawable) 0.089ct rough (trigon) Sale price¥27,800

[Sale on June 21 at 10 PM] Jeremejevite from Namibia 0.139ct Loose Stone with Certification Sale price¥29,800

[Sale on June 25th at 10 PM] Jeremejevite from Namibia, 0.095ct loose stone, with鑑別書 Sale price¥24,800

[On sale June 21, 10 PM] Jeremejevite 0.089ct Loose Stone from Namibia with certificate Sale price¥25,800

[On sale June 26, 10 PM JST] Russian rough diamond (sawable) 0.148ct (trigon) Sale price¥49,800

[On Sale June 24 at 10 PM] Zimbabwe Euclase 0.183 ct Loose Stone with Certificate Sale price¥35,800

[On Sale June 26th at 10 PM] Zimbabwean Euclase 3.4mm/0.206ct Loose Gemstone with Certification Sale price¥29,800

Diamond (cabochon cut) 0.206ct loose Sale price¥45,800

Brazilian alexandrite 0.116ct loose Sale price¥15,800

Brazilian Paraiba Tourmaline 0.052ct Loose Stone (CuO:2.0%, MnO:2.2%) Sale price¥35,800

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.