5 major gems

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ブラウンダイヤモンド 0.554ctルース(UNDER S(LIGHT YELLOWISH BROWN), SI-2)

Brown Diamond 0.554 ct Loose (Color Distribution / LIGHT YELLOWISH BROWN, SI-2)

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Vietnam unheated silky pink sapphire 0.178ct loose stone

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Colombian No-Oil Emerald 0.120ct Loose Stone GIA

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Sri Lankan Yellow Sapphire 0.835ct Loose

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Mexican Fire Opal 1.104ct Loose

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Diamond 0.320ct loose (D, VS2)

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【12562506掲載】スリランカ産非加熱スターサファイア 1.016ctルース

Sri Lankan Unheated Star Sapphire 1.016ct Loose Gemstone

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【On sale 5/6 at 10 PM JST】Unheated Sri Lankan Star Sapphire 0.758ct Loose Gemstone

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【12562512掲載】スリランカ産非加熱スターサファイア 0.692ctルース

Unheated Sri Lankan Star Sapphire Loose Stone 0.692ct

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【12562517掲載】スリランカ産非加熱スターサファイア 0.450ctルース

Unheated Sri Lankan Star Sapphire 0.450ct Loose Stone

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Ruby 0.289ct loose stone by Takakikyo

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Unheated Pigeon Blood Ruby 0.260ct Loose Stone AIGS

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[Yukinko Cut] Synthetic Sapphire 2.220ct Loose (Synthetic Blue Sapphire)

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Canadian raw diamond (sawable) 0.328ct raw (with trigons)

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[Sakura Shape] Synthetic Sapphire 3.285ct Loose Stone

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Peruvian Bi-Color Blue Opal 2.707ct Loose Stone

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Peruvian Bicolor Blue Opal 3.757ct Loose Stone

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[On sale May 3rd, 10 PM JST] Peruvian Bi-Color Blue Opal 4.067ct Loose Stone

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Peruvian Bicolor Blue Opal 4.862ct Loose

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Loose 0.264ct Sri Lankan Blue Sapphire

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Sri Lankan Blue Sapphire 5.5mm/0.826ct Loose Stone

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【Sale from 10 PM on May 5th】Mexican Opal 0.244 ct Loose Stone (Contraluz Opal)

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Untreated Sri Lankan Star Sapphire 0.403 ct Loose

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0.430ct Unheated Sapphire Loose Stone from Kashmir

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Diamond 0.185ct Loose Stone (I, SI1, Ashoka Cut)

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K18 Red Coral from Kochi Prefecture (0.41ct), Diamond (0.03ct) Ring

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K18 Blood Coral from Kochi Prefecture (0.56ct), Diamond (0.08ct) Ring

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[Published 12562689] Mexican Water Opal 1.018ct Loose Stone

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【12562747掲載】マダガスカル産非加熱ティールグリーンサファイア 1.740ctルース

Madagascar Unheated Teal Green Sapphire 1.74ct Loose GIA

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[On sale May 6, 10 PM JST] Mexican Cantera Opal Loose Stone, 2.096 ct

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Mexican Cantera Opal 8.097ct Loose

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Pink Diamond 2.3mm/0.049ct Loose Stone (FANCY PINK, VS-1) Central Gem Lab

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ピンクダイヤモンド 0.060ctルース(FANCY INTENSE PINK, VS-2)

Pink Diamond 0.060ct Loose (FANCY INTENSE PINK, VS-2) CBT

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カメレオンダイヤモンド 0.153ctルース(LIGHT GRAY GREEN, SI-1)

Chameleon Diamond 0.153ct Loose (LIGHT GRAY GREEN, SI-1)

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【32501878掲載】グレーダイヤモンド 0.109ctルース(VERY LIGHT GRAY, SI-1)

Gray Diamond 3.0mm/0.109ct Loose (VERY LIGHT GRAY, SI-1)

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Colombian mica in emerald 1.314ct loose

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Mexican Fire Opal 0.290ct Loose (Faceted Cut)

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2.503 ct Loose Emerald with Pyrite from Colombia

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Loose Columbian Pyrite in Emerald 3.346 ct

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Colombian Pyrite Inclusion Emerald 2.780ct Loose Rare Stone [Limited to 1 pc] ¥198,000 12562799

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[Sale starts 10 PM JST on 5/14] Colombian Emerald 1.571ct Loose Stone Pendant Top

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[On sale 5/5 at 22:00] Colombian Emerald 4.7mm/0.468ct Loose Stone

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【12562785掲載】コロンビア産エメラルドキャッツアイ 0.574ctルース

【On sale May 2nd, 10 PM JST】Colombian Emerald Cat's Eye 0.574ct Loose Stone

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Untreated Vietnamese Star Ruby 1.696ct Loose Stone with Certification

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【32501881掲載】インターナリーフローレスダイヤモンド（H&C） 0.340ctルース(F, IF, 3Excellent H&C)

Internally Flawless Diamond (H&C) 4.5mm/0.340ct Loose (F, IF, 3Excellent H&C) GIA & CBT

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フローレスダイヤモンド（H&C） 0.230ctルース(D, FL, 3Excellent H&C)

Flawless Diamond (H&C) 4.0mm/0.230ct Loose (D, FL, 3Excellent H&C) GIA & Central Gem Laboratory

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【32501889掲載】ダイヤモンド（H&C） 0.194ctルース(G, VVS-1, 3Excellent H&C)

Diamond (H&C) 3.7mm/0.194ct Loose (G, VVS-1, 3Excellent H&C)

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.