Vertical: 5.1 - 6.0mm

[Available 10/16, 10 PM] Russian Malyshevo Phenakite 0.489ct Loose Stone (JGL Certified) Sale price¥15,800

【Available Oct 15 at 10 PM】 Sri Lankan Green Zircon 0.802ct Loose Gemstone Sale price¥16,800

Tanzanian Dragon Garnet 0.748ct Loose Stone Sale price¥18,800

Nigerian Aventurine Aquamarine 0.471ct Loose Stone Sale price¥6,980

Cassiterite 1.658ct loose stone (bicolor cassiterite) Japan-Germany exchange Sale price¥98,000

[Lottery Sale 0725_05] Madagascar Teal Blue Sapphire 0.748ct Loose Stone with Appraisal Sale price¥28,800

【Lottery Sale 0718_07】Tanzanian Pink Zoisite 0.398ct Loose Stone with Certificate Sale price¥59,800

[Lottery Sale ②_202608_07] Myanmar Orange Spinel 0.855ct Loose Stone Sale price¥98,000

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

Tanzania Bicolor Zoisite 0.397ct Loose Stone Sale price¥8,800

[Available 9/4 at 10 PM] Ruby 0.411ct Loose Stone Sale price¥18,800

[9/7 22:00 Release] Pakistani Oil-in-Quartz 0.505ct Loose Stone Sale price¥4,980

[Available 9/7 at 10 PM] Mahenge Spinel (Pink Spinel) from Tanzania, 0.386ct loose stone Sale price¥15,800

[Available 9/7 at 10 PM] Indian Parrot Chrysoberyl 0.630ct Loose Gemstone Sale price¥18,800

Amazonian green opal 0.517ct loose stone (faceted cut) Sale price¥7,980

Amazon Green Opal 0.285ct Loose (Faceted Cut) Sale price¥6,980

Oregon Sunstone from the United States 0.292ct loose stone Sale price¥6,980

Brazilian Particolor Paraiba Tourmaline 0.490ct Loose (Bicolor Paraiba Tourmaline) GIA Sale price¥398,000

Tanzania Bicolor Zoisite 0.357ct Loose Stone Sale price¥6,980

[Available 8/30 at 10 PM] Colombian Mint Color Emerald 0.359ct Loose Stone Sale price¥12,800

[8/30 10:00 PM Release] Mexican Fire Opal 0.352ct Loose Stone Sale price¥7,980

[#202607 Akihabara Pop-up Store - Currently Removed from Stock] [Listed as 12555668] Cambodian Colorless Zircon 0.929ct Loose Stone Sale price¥9,800

Pakistani Peridot 5.2mm/0.562ct Loose Stone Sale price¥9,800

【#202607 Akihabara Pop-up, Currently Out of Office】【12563057 Listed】Sri Lankan Royal Blue Sapphire 1.060ct Loose Stone Sale price¥188,000

[Available 9/1 at 10 PM] Afghan Mint Color Tourmaline 0.290ct Loose Stone Sale price¥14,800

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

[On sale 9/3 at 22:00] Sri Lankan Purple Sapphire 0.556ct Loose Gemstone with Identification Report Sale price¥55,800

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

【Available Sept 3, 10:00 PM】YAG (Yttrium Aluminum Garnet) 5.7mm/0.992ct Loose Stone Sale price¥12,800

[Available 9/3, 10 PM] Brazilian Rhodonite in Quartz 0.438ct Loose Stone Sale price¥8,800

【Available 9/3, 10:00 PM】 Sri Lankan Blue Sapphire 0.451ct Loose Gemstone with Appraisal Report Sale price¥29,800

【Sales start 8/24 10 PM JST】Brazilian Strawberry Quartz 5.9mm/0.830ct Loose Stone Sale price¥6,980

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

[On sale August 23rd at 10 PM] US Oregon Sunstone 6.0mm/ 0.729ct Loose Sale price¥18,800

[On sale August 27th at 10 PM] Sri Lankan green sapphire 0.354ct loose stone with certificate Sale price¥12,800

[On sale August 27th at 10 PM] Tanzanian spinel, 0.644ct loose stone (with needle inclusions) with a gemological report Sale price¥19,800

[On sale August 27 at 10 PM] Tanzanian Spinel 0.536ct Loose (with needle inclusions) - with appraisal report Sale price¥15,800

Zimbabwe Euclase 0.134ct Loose Sale price¥25,800

[On sale 8/23 10 PM JST] Brazilian Apatite Cat's Eye from Rio Grande do Norte, 5.0mm/0.740ct Loose Stone with Certificate Sale price¥14,800

[On sale August 28, 10 PM] Nigerian Indicolite Tourmaline 0.340ct Loose Stone with Certificate Sale price¥29,800

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

[Listed as 12563918] Sri Lankan Purple Sapphire 0.730ct Loose Stone Sale price¥55,800

[Posted 12563878] Green Hauyne from Afghanistan, 0.222 ct Loose Stone Sale price¥79,800

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

インターナリーフローレスダイヤモンド 0.300ctルース(D, IF) GIA

[Lottery Sale ①_202608_12] Internally Flawless Diamond 0.300 ct Loose (D, IF) GIA Sale price¥118,000

American Herkimer Diamond (Rock Crystal) 5.5mm/0.534ct Loose Sale price¥8,800

American Herkimer Diamond (Rock Crystal) 5.3mm/0.594ct Loose Sale price¥7,980

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

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.