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5 major gems

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Sold out Colombian emerald rough stone 11.155ct (with pyrite)

Colombian emerald rough stone 11.155ct (with pyrite)
Sold out [12/7 22:00] Sri Lankan Yellow Sapphire 0.508ct Loose

[12/7 22:00] Sri Lankan Yellow Sapphire 0.508ct Loose
Sold out ベトナム産非加熱シルキーピンクサファイア 0.197ctルース

Unheated silky pink sapphire from Vietnam 0.197ct loose
Sold out オパール 0.595ctルース

Opal 6mm/0.595ct loose (rose cut)
Sold out マダガスカル産バイカラーサファイア 0.212ctルース

Bicolor sapphire from Madagascar 0.212ct loose
Sold out マダガスカル産バイカラーサファイア 0.259ctルース

Bicolor sapphire from Madagascar 0.259ct loose
Sold out ピンクサファイア 0.881ctルース

Pink sapphire 0.881ct loose

Sold out Unheated Pigeon Blood Ruby 0.710ct Loose Stone AIGS

Unheated Pigeon Blood Ruby 0.710ct Loose Stone AIGS
Sold out Royal Blue Sapphire 1.00ct Loose AIGS

Royal Blue Sapphire 1.00ct Loose AIGS

Sold out Unheated star ruby ​​from Myanmar, 0.617ct loose

Unheated star ruby ​​from Myanmar, 0.617ct loose
Sold out Cornflower Blue Sapphire 4.5mm/0.430ct Loose Stone AIGS

Cornflower Blue Sapphire 4.5mm/0.430ct Loose Stone AIGS
Sold out Unheated Burmese Ruby 0.227ct Loose Stone, Nikko Kan

Unheated Burmese Ruby 0.227ct Loose Stone, Nikko Kan
Sold out Tanzanian Violet Sapphire 0.920ct Loose

Tanzanian Violet Sapphire 0.920ct Loose
Sold out Mozambique Ruby 0.481ct Loose Stone with Certificate of Authenticity

Mozambique Ruby 0.481ct Loose Stone with Certificate of Authenticity
Sold out 0.245ct rough diamond (with trigon)

0.245ct rough diamond (with trigon)
Sold out 18K Yellow Gold Brazilian Paraiba Tourmaline 0.048ct Diamond Pinky Ring (CuO: 1.7%, MnO: 2.2%)

18K Yellow Gold Brazilian Paraiba Tourmaline 0.048ct Diamond Pinky Ring (CuO: 1.7%, MnO: 2.2%)
Sold out K18/Pt950 Brazilian Paraiba tourmaline 0.071ct diamond ring (K18YG, CuO: 1.9%, MnO: 2.2%)

K18/Pt950 Brazilian Paraiba tourmaline 0.071ct diamond ring (K18YG, CuO: 1.9%, MnO: 2.2%)
Sold out K18/Pt950 Brazilian Paraiba Tourmaline and Diamond Pendant Top (Necklace Top)

K18/Pt950 Brazilian Paraiba Tourmaline and Diamond Pendant Top (Necklace Top)
Sold out ダイヤモンド 0.126ctルース(F, VS2)

Diamond 0.126ct loose (F, VS2, octagonal cut)
Sold out ダイヤモンド 0.096ctルース(D, SI1)

Diamond 0.096ct loose (D, SI1, octagonal cut)
Sold out Cornflower Blue Sapphire 0.680ct Loose AIGS

Cornflower Blue Sapphire 0.680ct Loose AIGS
Sold out Sri Lankan Yellow Sapphire 0.526ct Loose

Sri Lankan Yellow Sapphire 0.526ct Loose
Sold out 1.091ct loose Australian black opal

1.091ct loose Australian black opal
Sold out Australian black opal 0.435ct loose stone

Australian black opal 0.435ct loose stone
Sold out Australian black opal 3.148ct loose

Australian black opal 3.148ct loose
Sold out 0.321ct Blue Sapphire Loose Gemstone from Sri Lanka

0.321ct Blue Sapphire Loose Gemstone from Sri Lanka
Sold out Unheated Blue Sapphire from Madagascar, 1.380ct Loose, AIGS

Unheated Blue Sapphire from Madagascar, 1.380ct Loose, AIGS

Sold out Unheated Madagascar Purple Sapphire 1.170ct Loose GIT

Unheated Madagascar Purple Sapphire 1.170ct Loose GIT

Sold out 南アフリカ産ダイヤモンド（メイカブル） 0.193ct原石

South African yellow diamond (makeable) 0.193ct rough stone

Sold out 【12546496掲載】ベトナム産非加熱シルキーピンクサファイア 0.161ctルース

Unheated silky pink sapphire from Vietnam 0.161ct loose
Sold out Colombian oil-free emerald 0.17ct loose GIA

Colombian oil-free emerald 0.17ct loose GIA

Sold out Mexican fire opal 0.235ct loose (facet cut)

Mexican fire opal 0.235ct loose (facet cut)
Sold out 0.168ct Unheated Silky Pink Sapphire from Vietnam

0.168ct Unheated Silky Pink Sapphire from Vietnam
Sold out 0.218ct Unheated Silky Pink Sapphire from Vietnam

0.218ct Unheated Silky Pink Sapphire from Vietnam
Sold out Unheated Vietnamese Silky Pink Sapphire 0.291ct Loose Stone

Unheated Vietnamese Silky Pink Sapphire 0.291ct Loose Stone
Sold out Canadian rough diamond (sawable) 0.099ct rough with trigon

Canadian rough diamond (sawable) 0.099ct rough with trigon
Sold out 0.628ct Pink Star Sapphire Loose Gemstone from Sri Lanka

0.628ct Pink Star Sapphire Loose Gemstone from Sri Lanka
Sold out 18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring

18K Yellow Gold Lavender Tanzanite 3.5mm/0.211ct Diamond Ring
Sold out 18K Yellow Gold American Peridot 0.339ct Diamond Ring

18K Yellow Gold American Peridot 0.339ct Diamond Ring

Sold out Ruby 0.258ct loose

Ruby 0.258ct loose

Sold out パパラチアサファイア 0.191ctルース

Padparadscha sapphire 0.191ct loose stone

Sold out Pigeon's Blood Ruby 4.0mm/0.230ct Loose AIGS

Pigeon's Blood Ruby 4.0mm/0.230ct Loose AIGS
Sold out Pigeon blood ruby ​​0.310ct loose

Pigeon blood ruby ​​0.310ct loose
Sold out 0.243ct Colombian Emerald Pair Loose Stones

0.243ct Colombian Emerald Pair Loose Stones
Sold out Ruby 3.3mm/0.171ct Loose

Ruby 3.3mm/0.171ct Loose
Sold out Cornflower Blue Sapphire 0.370ct Loose AIGS

Cornflower Blue Sapphire 0.370ct Loose AIGS
Sold out Pt950 Bicolor Sapphire Pendant Top (Necklace Top)

Pt950 Bicolor Sapphire Pendant Top (Necklace Top)

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.