Login
ラウンドカット

Round Cut

Sort by
パープルスピネル 0.422ctルース

Purple Spinel 4.8mm/0.422ct Loose Stone Sale price¥6,980
ピンクスピネル 0.573ctルース

Pink spinel 5.2mm/0.573ct loose stone Sale price¥6,580
スピネル 0.365ctルース

Purple spinel 4.5mm/0.365ct loose Sale price¥4,980
ピンクスピネル 0.342ctルース

Pink spinel 4.3mm/0.342ct loose Sale price¥6,980
ピンクスピネル 0.192ctルース

Pink spinel 3.8mm/0.192ct loose Sale price¥5,980
【12548939掲載】マダガスカル産ラズライトインクォーツ 1.600ctルース

Lazurite in quartz from Madagascar 7.5mm/1.600ct loose Sale price¥18,800
[On sale June 17th at 10 PM] Canadian Eudialyte 2.4mm/0.052ct Loose Stone with Appraisal

[On sale June 17th at 10 PM] Canadian Eudialyte 2.4mm/0.052ct Loose Stone with Appraisal Sale price¥15,800
coming soon 【12563195掲載】コンゴ産ピンクトルマリン 1.056ctルース

[Lottery Sale_0612_03] [Sakura Cut] Pink Tourmaline from Congo 7.0mm/1.056ct Loose Stone with Certificate Sale price¥49,800
Sold out マダガスカル産バイカラーサファイア 0.741ctルース

[On sale June 14th at 10 PM] Madagascar Bi-Color Sapphire 5.3mm/0.741ct Loose Stone
coming soon マダガスカル産バイカラーサファイア 0.607ctルース

Madagascar Bi-color Sapphire 0.607ct Loose Stone Sale price¥14,800
coming soon マダガスカル産バイカラーサファイア 0.271ctルース

Madagascar bicolor sapphire 0.271ct loose stone Sale price¥6,980
Sold out ナイジェリア産コバルトガーナイト 0.095ctルース

[On sale June 7th at 10 PM] Nigerian Cobalt Hauyne Loose Stone, 0.095ct, with AGL certificate
Sold out マダガスカル産パパラチアサファイア 0.296ctルース

[On Sale June 6th at 10 PM] Madagascar Padparadscha Sapphire 3.9mm/0.296ct Loose Stone with DGL Certificate
Sold out スリランカ産コバルトスピネル 0.461ctルース

[Sale on June 7 at 10 PM] Sri Lankan Cobalt Spinel 4.7mm/0.461ct Loose Stone (Japan-Germany certified)
coming soon [Lottery Sale 0530_06] Internally Flawless Diamond (H&C) 0.527ct Loose Stone (E, IF, 3Excellent H&C)

[Lottery Sale 0530_06] Internally Flawless Diamond (H&C) 0.527ct Loose Stone (E, IF, 3Excellent H&C) Sale price¥228,000
Sold out カシミール産サファイア 0.090ctルース

Kashmir Sapphire 2.5mm/0.090ct Loose Stone GIA

coming soon 【12563302掲載】カシミール産非加熱サファイア 0.100ctルース

[Lottery Sale 0531_04] Unheated Kashmir Sapphire 2.6mm/0.100ct Loose Stone GIA Sale price¥79,800
coming soon [Lottery Sale 0531_03] Unheated Kashmir Sapphire 2.7mm/0.090ct Loose GIA

[Lottery Sale 0531_03] Unheated Kashmir Sapphire 2.7mm/0.090ct Loose GIA Sale price¥59,800
Sold out マダガスカル産アンデシン・ラブラドライト（通称名 レインボームーンストーン） 1.087ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 6.1mm/1.087ct loose stone
Sold out Andesine Labradorite from Madagascar (commonly known as Rainbow Moonstone) 0.826ct loose

Andesine Labradorite from Madagascar (commonly known as Rainbow Moonstone) 0.826ct loose
Sold out マダガスカル産アンデシン・ラブラドライト（通称名 レインボームーンストーン） 0.971ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 6.2mm/0.971ct Loose Stone
Sold out ダイヤモンド 3.2mm/0.124ctルース(D, VS-2, VeryGood)

【On Sale 5/30 10 PM】Diamond 3.2mm/0.124ct Loose Stone (D, VS-2, VeryGood)
Sold out ブラウンダイヤモンド 0.600ctルース(FANCY LIGHT BROWN, SI-2)

Brown Diamond 5.3mm/0.600ct Loose Stone (FANCY LIGHT BROWN, SI-2)

Sold out グレーダイヤモンド 0.064ctルース(LIGHT BLUISH GRAY, SI-1)

Gray Diamond 2.5mm/0.064ct Loose (LIGHT BLUISH GRAY, SI-1) Rare Stone

Sold out グレーダイヤモンド 0.039ctルース(LIGHT BLUISH GRAY, VS-1)

Gray Diamond 2.1mm/0.039ct Loose (LIGHT BLUISH GRAY, VS-1)

Sold out ケニア産ツァボライト 0.386ctルース

[On sale May 30th at 10 PM] Kenyan Tsavorite 4.1mm/0.386ct Loose Stone
coming soon [Lottery Sale 0530_03] Internally Flawless Diamond 4.2mm/0.272ct Loose (D, IF, 3Excellent H&C) GIA

[Lottery Sale 0530_03] Internally Flawless Diamond 4.2mm/0.272ct Loose (D, IF, 3Excellent H&C) GIA Sale price¥148,000
coming soon [Lottery Sale 0530_02] Internally Flawless Diamond 3.8mm/0.217ct Loose Stone (D, IF, 3Excellent H&C) GIA

[Lottery Sale 0530_02] Internally Flawless Diamond 3.8mm/0.217ct Loose Stone (D, IF, 3Excellent H&C) GIA Sale price¥98,000
Sold out スペイン産アンダリュサイト 0.469ctルース

[On sale May 24, 10 PM JST] Spanish Andalusite 5.0mm/0.469ct Loose Stone

Sold out 合成アレキサンドライト 0.663ctルース

[On sale May 17th at 10 PM] Synthetic Alexandrite 5.1mm/0.663ct Loose Gemstone
Sold out Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan

Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan
Sold out マダガスカル産アンデシン・ラブラドライト（通称名 レインボームーンストーン） 1.003ctルース

Madagascar Andesine Labradorite (also known as Rainbow Moonstone) 1.003ct loose stone
Sold out インターナリーフローレスダイヤモンド（H&C） 0.300ctルース(D, IF, 3Excellent H&C)

Internally Flawless Diamond (H&C) 4.3mm/0.300ct Loose (D, IF, 3Excellent H&C) GIA&CGL

Sold out ダイヤモンド（H&C） 0.200ctルース(D, VVS-2, 3Excellent H&C)

Diamond (H&C) 3.8mm/0.200ct Loose (D, VVS-2, 3Excellent H&C) CBT

Sold out ダイヤモンド 0.310ctルース(E, VS1, 3Excellent)

Diamond 4.3mm/0.310ct Loose (E, VS1, 3Excellent) GIA

Sold out ダイヤモンド 3.0mm/0.101ctルース(D, VVS-2, VeryGood)

Diamond 3.0mm/0.101ct Loose Stone (D, VVS-2, VeryGood)

Sold out ダイヤモンド 0.095ctルース(F, VS-2, Excellent)

Diamond 3.0mm/0.095ct Loose (F, VS-2, Excellent)

Sold out 【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)

Sold out 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

coming soon 【Lottery Sale 0530_04】Flawless Diamond (H&C) 4.2mm/0.280ct Loose (D, FL, 3Excellent H&C) GIA&CGL

【Lottery Sale 0530_04】Flawless Diamond (H&C) 4.2mm/0.280ct Loose (D, FL, 3Excellent H&C) GIA&CGL Sale price¥210,000
coming soon 【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab

【Lottery Sale 0530_05】Flawless Diamond (H&C) 4.3mm/0.290ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥218,000
Sold out 【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

Sold out Lazulite from Pakistan 2.5mm/0.063ct Loose Gemstone with Certificate

Lazulite from Pakistan 2.5mm/0.063ct Loose Gemstone with Certificate
Sold out 【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)
Sold out ピンクダイヤモンド 0.049ctルース(FANCY PINK, VS-1)

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

Sold out 【12562750掲載】ミャンマー産レッドスピネル 0.257ctルース

Myanmar Red Spinel 3.7mm/0.257ct Loose Gemstone with Certificate

Sold out 【12562749掲載】タンザニア産オレンジスピネル 0.273ctルース

Tanzanian Orange Spinel 3.9mm/0.273ct Loose Stone with Gemstone Report

Sold out 【12561981掲載】アメリカ産オレゴンサンストーン 1.893ctルース

Oregon Sunstone from the USA, 8.1mm/1.893ct, loose

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.