Coming soon

[On sale 9/13 at 22:00] Bi-color Euclase from Zimbabwe, 0.075ct loose stone with identification report Sale price¥18,800

[On sale 9/15 at 10 PM] Tanzanian Blue Spinel 0.725ct Loose Gemstone with Identification Report Sale price¥22,800

[Available 9/15, 10 PM] Tanzanian Blue Spinel 0.449ct Loose Gemstone with Identification Report Sale price¥12,800

[Available 9/12 at 10 PM] Kenyan Unheated Gold Sheen Sapphire 0.314ct Loose Gemstone with Appraisal Report Sale price¥22,800

[Available 9/17 at 10:00 PM] Kenyan Unheated Gold Sheen Sapphire 0.408ct Loose Gemstone with Identification Report Sale price¥25,800

[9/11 10 PM Sale] Burmese Red Spinel 0.146ct Loose Stone with Appraisal Report Sale price¥15,800

[Available 9/11 at 10 PM] Burmese Red Spinel 0.100ct Loose Stone with Identification Report Sale price¥11,000

[9/13 10:00 PM Release] Spanish Pink Cobalt Calcite 0.523ct Loose Stone with Gem Identification Report Sale price¥39,800

[Available 9/13, 10:00 PM] Spanish Pink Cobalt Calcite 0.443ct Loose Stone with Identification Report Sale price¥35,800

【Available 9/17 at 10:00 PM】 Phenakite from Malyshevo, Russia, 0.510ct loose stone, JGL certified Sale price¥15,800

[Available 9/17 at 10:00 PM] Russian Phenakite from Malyshevo, 0.493ct Loose Gemstone, JGGL Certified Sale price¥14,800

[On sale 9/29, 10 PM] Russian Malyshevo Phenakite 4.7mm/0.428ct Loose Stone, JGL Certified Sale price¥14,800

[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

[Available 10/4, 10 PM] Kenyan Unheated Gold Sheen Sapphire 0.224ct Loose Gemstone with Identification Report Sale price¥15,800

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

[9/7 10 PM Release] Brazilian Bicolor Tourmaline 3.337ct Loose Stone Sale price¥59,800

[Lottery Sale 0812_19] Bolivian Phosphophyllite 1.806ct Loose Stone with Gemstone Identification Report Sale price¥69,800

【Lottery Sale 0818_02】Brazilian Fanaizinho Sphene 0.956ct Loose Stone with Certificate Sale price¥19,800

K18 マダガスカル産パパラチアサファイア 4.3mm/0.412ct・ダイヤモンド0.57ctリング中宝鑑

[Lottery Sale 0812_11] K18 Madagascar Padparadscha Sapphire 0.412ct / Diamond 0.57ct Ring Sale price¥168,000

インターナリーフローレスダイヤモンド（H&C） 4.0mm/0.245ctルース(D, IF, 3Excellent H&C)

【9/6 10:00 PM Sale】Internally Flawless Diamond (H&C) 4.0mm/0.245ct Loose (D, IF, 3Excellent H&C) Sale price¥128,000

[Lottery Sale 3][For Winners Only][Listed as 22602615] K18/Pt950 Brazilian Paraiba Tourmaline 0.053ct Ring (CuO: 1.4%, MnO: 3.1%) Sale price¥158,000

[Available 9/5 at 10 PM] Brazilian Paraiba Tourmaline 4.022ct Loose Gemstone Sale price¥45,800

【9/5 22:00 Release】 Brazilian Paraiba Tourmaline 20.343ct Rough Stone Sale price¥15,800

[Available 9/5, 10 PM] 8.246ct Rough Paraiba Tourmaline from Brazil Sale price¥25,800

Pt900 キャシテライト 4mm/0.57ct ・ダイヤモンド0.16ctペンダントトップ（ネックレストップ）鑑別書

[Lottery Sale 0812_03] Pt900 Cassiterite from Yunnan Province, China 4mm/0.57ct Diamond 0.16ct Pendant Top (Necklace Top) with Appraisal Certificate Sale price¥69,800

[Lottery Sale ②_202608_02] Unheated Kashmir Sapphire 2.6mm/0.110ct Loose Stone GIA Sale price¥79,800

【Lottery Sale ②_202608_12】Brazilian Bi-Color Pink Euclase 3.210ct Loose Stone with Japan-Germany Gemological Report Sale price¥798,000

[Lottery Sale 0620_03] South African Rhodochrosite 2.694ct Loose Stone Sale price¥228,000

[Listed under 12563270] South African rough diamond (sawable) 0.477ct Sale price¥178,000

[Lottery Sale 0718_05] Unheated Australian Teal Blue Sapphire 1.010 ct Loose GIA Sale price¥128,000

Spanish Sphalerite 2.726ct loose stone Sale price¥32,800

Spanish bicolor sphalerite 3.504ct loose stone Sale price¥35,800

1.953ct Bicolor Sphalerite from Spain Sale price¥18,800

Zimbabwean Apatite (UV Type) 0.585ct Loose Sale price¥8,800

Zimbabwean Apatite (UV type) 0.209ct loose stone Sale price¥4,980

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

Brazilian Lepidocrocite in Quartz 1.126ct Loose Stone Sale price¥9,800

Violet Sapphire 4.3mm/0.328ct Loose Sale price¥15,800

Brazilian Morganite 4.720ct loose stone Sale price¥98,000

Indian Cavansite 1.171ct loose stone Sale price¥8,800

Mozambique Pink Tourmaline 1.122ct Loose Stone (Contains CuO) Sale price¥39,800

【12551314掲載】ジンバブエ産ブルーアパタイト（UVタイプ） 1.019ctルース

Zimbabwean Blue Apatite (UV Type) 1.019ct Loose Sale price¥8,800

Bicolor Euclase from Zimbabwe 0.033ct loose Sale price¥18,800

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

Manganotantalite 0.736ct loose stone from Japan and Germany Sale price¥128,000

[Lottery Sale ②_9][Winners Only][Listing 12563396] Brazil Rutile (Single Crystal) 1.474ct Loose Stone with Certification Sale price¥39,800

[Lottery Sale 0707_10] Unheated Montana Sapphire (Yogo Mine) 0.173ct Loose Stone with Japan-Germany Gemological Report Sale price¥98,000

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.