Bicolor/Party color system

Some gemstones exhibit multiple colors within a single stone; two colors are called bicolor, three colors are tricolor, and multiple colors are called particolor. Some are clearly separated, while others have a gradation, so I think these are gemstones that give you a sense of their individuality.

Karatz GemMagazine
" Bicolor gemstone "

[Lottery Sale #2_202608_13] Brazilian Tetracholor Tourmaline 11.847ct Loose Stone with Certificate Sale price¥258,000

Brazilian bicolor tourmaline 0.914ct loose stone Sale price¥12,800

Brazilian bicolor tourmaline cat's eye 22.056ct loose stone Sale price¥188,000

Congo Bicolor Tourmaline 3.429ct Loose Sale price¥98,000

Brazilian Limonite in Topaz 6.829ct loose stone Sale price¥14,800

Brazilian Limonite in Topaz 5.709ct loose stone Sale price¥8,800

ブラジル産ポンポンクォーツ（ラジエーテッドクリスタルインクォーツ） 3.913ctルース

Brazilian Pompon Quartz (Radiated Crystal in Quartz) 3.913ct Loose Stone Sale price¥9,800

【11/6 22時販売】スペイン産スファレライト 6.252ctルース Sale price¥79,800

[Item 12564612] Unheated Bicolor Sapphire from Windsor, Tanzania, 0.620ct Loose Gemstone Sale price¥75,800

[Lottery Sale_01][For Winners Only][Item 12564184] East African Unheated Bicolor Sapphire 0.510ct Loose GIA Sale price¥98,000

【10/3 10 PM Release】Unheated Bicolor Sapphire from Winza, Tanzania 0.500ct Loose Gemstone with Identification Report Sale price¥59,800

[Available 10/2 at 10 PM] Unheated Bicolor Sapphire from Winza, Tanzania, 0.460ct Loose Stone with Gem Identification Report Sale price¥59,800

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

[10/2 10 PM Release] Brazilian Ametrine 16.565ct Loose Gemstone Sale price¥29,800

[On sale 9/30 at 10 PM] Bolivian Ametrine 4.815ct Loose Stone Sale price¥12,800

[10/2 10 PM Sale] Bolivian Ametrine 4.234ct Loose Stone Sale price¥18,800

[Available Oct 2, 10:00 PM] Bolivian Ametrine 2.680ct Loose Stone Sale price¥12,800

【Lottery Sale 0818_08】Brazilian Bicolor Tourmaline 2.744ct Loose Stone with Certificate Sale price¥59,800

Brazilian parti-color tourmaline 2.702ct loose stone Sale price¥69,800

アフガニスタン産アフガニスタン産ラズライトインソーダライト 0.425ctルース

[Available 9/18 10:00 PM] Lazulite in Sodalite from Afghanistan 0.425ct Loose Gemstone Sale price¥9,800

アフガニスタン産バイカラートルマリン（通称名：バイカラールベライト） 2.736ctルース

Afghanistan Bicolor Tourmaline (also known as Bicolor Rubellite) 2.736ct loose stone Sale price¥69,800

アフガニスタン産バイカラートルマリン（通称名：バイカラールベライト） 3.512ctルース

Bicolor Tourmaline from Afghanistan (common name: Bicolor Rubellite) 3.512ct loose Sale price¥89,800

アフガニスタン産バイカラートルマリン（通称名：バイカラールベライト） 2.888ctルース

Afghanistan Bicolor Tourmaline (also known as Bicolor Rubellite) 2.888ct Loose Sale price¥79,800

Tanzanian Zoisite 1.000ct Loose Stone Sale price¥18,800

Tanzania Bicolor Zoisite 0.645ct Loose Stone Sale price¥11,800

Sri Lankan glass body (sapphire crystal) 7.983ct rough stone Sale price¥19,800

[Available 9/29 at 10 PM] Zimbabwean Bicolor Euclase 0.100ct Loose Gemstone with Identification Report Sale price¥19,800

[On sale 10/9 at 22:00] Zimbabwean Bicolor Euclase 0.096ct Loose Gemstone with Identification Report Sale price¥22,800

[Available 9/13, 10 PM] Bicolor Euclase from Zimbabwe, 0.068ct Loose Gemstone with Identification Report Sale price¥14,800

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

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

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

【Available Sept 10, 10:00 PM】 Tanzanian Bicolor Grossular Garnet 0.869ct Loose Stone Sale price¥25,800

[9/7 10:00 PM Sale] Tanzania Bicolor Grossular Garnet 0.433ct Loose Stone Sale price¥15,800

【Available 9/7 at 10 PM】 Tanzanian Bicolor Grossular Garnet 0.596ct Loose Gemstone Sale price¥14,800

[9/7 22:00 Release] Brazilian Bicolor Tourmaline 1.753ct Loose Stone Sale price¥29,800

Tanzania Bicolor Zoisite 0.278ct Loose Stone Sale price¥4,980

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

[Lottery Sale 0818_07] Madagascar Bi-Color Sapphire 1.870ct Loose Stone with Gem Identification Report Sale price¥79,800

[On sale August 22, 10 PM] Bi-Color Grossular Garnet from Kenya 0.278ct Loose Sale price¥12,800

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

[Listed as 12563455] Tanzanian Bi-color Grossular Garnet 0.801 ct Loose Stone Sale price¥19,800

[12563744 listed] Bi-color Tourmaline from Brazil 1.153ct Loose Stone Sale price¥12,800

[Posted as 12563742] Brazilian Bicolor Tourmaline, 1.524 ct loose stone Sale price¥18,800

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

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

[Posted as 12562691] Malawi Bicolor Zircon 2.082ct Loose Sale price¥128,000

0.319 ct Tanzanian bicolor grossular garnet loose stone Sale price¥19,800

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.