Product list

[Available 10/3, 10:00 PM] Santa Maria Aquamarine from Brazil, 0.318ct loose stone, with certificate of authenticity Sale price¥29,800

[10/4 10:00 PM Release] Mongolian Bicolor Andesine 8.0mm/1.861ct Loose Gemstone Sale price¥18,800

[Available 10/4, 10:00 PM] Mongolian Color-Change Andesine 8.0mm/1.829ct Loose Stone Sale price¥18,800

【Available 10/3 at 10 PM】 Colombian Mica-in-Emerald 4.2mm/0.249ct Loose Gemstone with Certificate of Authenticity Sale price¥22,800

【10/3 22:00 Release】 Colombian Mica-in-Emerald 0.140ct Loose Stone with Identification Report Sale price¥18,800

[Available 10/4, 10 PM] Brazilian Amethyst 4.850ct Loose Gemstone Sale price¥12,800

[Available 10/4, 10 PM] Brazilian Amethyst 3.842ct Loose Gemstone Sale price¥12,800

[On sale 10/4 at 22:00] Brazilian Amethyst 2.984ct Loose Gemstone Sale price¥11,800

[Available 10/4, 10 PM] Synthetic Ruby 1.803ct Loose Gemstone Sale price¥18,800

[10/4, 10:00 PM Sale] Synthetic Ruby 1.182ct Loose Stone Sale price¥12,800

[Available Oct 4, 10 PM] Synthetic Alexandrite 0.264ct Loose Gemstone Sale price¥9,800

[Available 10/4, 10 PM] Lab-created Alexandrite 0.614ct Loose Stone Sale price¥15,800

[Item 12564476] Black Moonstone from India, 0.568ct loose stone Sale price¥8,800

[Item 12564475] Green Moonstone from India, 3.445ct loose stone Sale price¥16,800

[Item 12564470] Australian Black Opal 0.261ct Loose Gemstone Sale price¥9,800

[Listing 12564464] Russian Phenakite 0.366ct Loose Stone Sale price¥18,800

[Available 10/2 at 10 PM] Brazilian Unheated Imperial Topaz (Sherry Color) 0.698ct Loose Gemstone Sale price¥98,000

[Available 10/2 at 10 PM] Sri Lankan Pink Sapphire 4.1mm/0.354ct Loose Gemstone with Appraisal Report Sale price¥22,800

[Ref: 12564481] Tanzanian Rhodolite Garnet 0.510ct Loose Stone Sale price¥9,800

[Item 12564466] Color Shift Amethyst 1.607ct Loose Stone Sale price¥9,800

Malawi Moonstone 1.640ct Loose Stone Sale price¥9,800

Malawi Moonstone (Malawi Moonstone) 2.121ct Loose Stone Sale price¥12,800

Malawi Moonstone (Malawi moonstone) 1.886ct loose stone Sale price¥11,800

[Deadline: 9/5 (Sat) 10 AM: Lottery Sale_11] Sri Lankan Blue Spinel 3.419ct Loose Stone with Identification Report Sale price¥158,000

[Deadline: Mon, 9/14, 10:00 AM: Lottery Sale_07] Madagascar Royal Blue Sapphire 4.0mm/0.377ct Loose Stone with Identification Report Sale price¥69,800

[Deadline: Sat, Sep 5, 10:00 AM: Lottery Sale_09] Sri Lankan Unheated Color-Change Sapphire 1.170ct Loose Stone, GIA certified Sale price¥188,000

[Item 12564367] Unheated Sri Lankan Purple Sapphire 0.870ct Loose Stone GIA Sale price¥128,000

[Item 12564511] Russian Alexandrite 0.103ct Loose Stone Sale price¥128,000

Royal Blue Sapphire 0.530ct Loose Stone Sale price¥69,800

[Item 22602768] [Color-Full] K18 0.35ct Diamond Ring with Appraisal Report Sale price¥128,000

[Item 12561430] Unheated Pigeon Blood Ruby 0.510ct Loose Stone Sale price¥89,800

[Item #22602735] [Colorifi] Pt900 Ice Blue Diamond (Treated) 0.24ct Diamond Ring with Appraisal Report Sale price¥89,800

Pt900 カラーチェンジサファイア0.446ct ダイヤモンド0.12ctリング鑑別書

[On sale 8/31 at 10 PM] [Colori] Pt900 Color-Change Sapphire 0.446ct Diamond 0.12ct Ring with Identification Report Sale price¥79,800

Pt900 スピネル 0.35ct・ダイヤモンド0.09ctペンダントトップ（ネックレストップ）鑑別書

[Item No. 22602792] [Colorify] Pt900 Spinel 0.35ct / Diamond 0.09ct Pendant Top (Necklace Top) with Appraisal Report Sale price¥39,800

[Listing 12556682] Zambian Emerald 0.202ct Loose Stone Sale price¥15,800

[Item 22602770] K18 Imperial Topaz Ring with Appraisal Report Sale price¥128,000

K18WG クレサンベール合成アレキサンドライト3.00ct プリンセスカット・ダイヤモンド0.12ct ペンダントトップ鑑別書

[Item No. 22602776] [Colorify] K18WG Synthetic Alexandrite 3ct, Diamond 0.12ct Pendant Top (Necklace Top) with Appraisal Report Sale price¥98,000

K18WG ダイヤモンド 0.5ct ペンダントトップ（ネックレストップ）鑑別書

[Item 22602774] [Color-Full] K18WG 0.5ct Diamond Pendant Top (Necklace Top) with Appraisal Report Sale price¥35,800

[Item 12563638] Tanzanian Bicolor Grossular Garnet 0.904ct Loose Stone Sale price¥25,800

[12564298] Phenakite from Malyshevo, Russia, 0.712ct Loose Gemstone Sale price¥22,800

[Item 12564299] Phenakite from Malyshevo, Russia, 0.635ct loose stone Sale price¥22,800

[12564313 listed] Spanish Pink Cobalt Calcite 0.360ct Loose Stone Sale price¥25,800

[Item 12564350] Ethiopian Sunstone 1.228ct Loose Gemstone Sale price¥18,800

Myanmar Star Peridot 3.644ct Loose Stone Sale price¥29,800

[Available 9/27 at 10 PM] Madagascar Andesine-Labradorite (Common name: Blue Moonstone) 4.518ct Loose Stone Sale price¥29,800

[Deadline 8/29 | Lottery Sale] Brazilian Indicolite Tourmaline 2.587ct Loose Stone, with NGL Certificate Sale price¥98,000

[9/14 (Mon) 10:00 AM Deadline: Lottery Sale_08] Unheated Pigeon Blood Ruby 0.270ct Loose Stone AIGS Sale price¥48,800

[Available 9/30 at 10:00 PM] Brazilian Elestial Amethyst 3.684ct Loose Gemstone Sale price¥8,800

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.