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diamond

Diamond is the birthstone of April. This gemstone is sometimes called the king of gemstones. It is said to be the hardest gemstone on earth, and its strong shine is exceptionally beautiful. Colorless is the most common, but it comes in a variety of shades including yellow, pink, blue, orange, and green.

Karatz GemMagazine
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Sold out A single loose pink diamond, including a fancy pink diamond, normally priced at 39,800 yen (multiple purchase discounts available)

A single loose pink diamond, including a fancy pink diamond, normally priced at 39,800 yen (multiple purchase discounts available)

Sold out Diamond gacha featuring a 0.072ct FANCY DEEP pink diamond, normally priced at 70,000 yen, and ice blue diamonds equivalent to VS class. (Multiple purchase discounts available)

Diamond gacha featuring a 0.072ct FANCY DEEP pink diamond, normally priced at 70,000 yen, and ice blue diamonds equivalent to VS class. (Multiple purchase discounts available)
Sold out Limited to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]

Limited to 10 stones: London Blue Diamond Gacha Loose Stone (including 3.6mm, VS-SI grade equivalent, treated) [Multiple purchase discounts available]
Sold out Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Light Pink) 1 stone loose (multiple purchase discount available)

Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Light Pink) 1 stone loose (multiple purchase discount available)
Sold out Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Intense Pink) 1 stone loose (multiple purchase discount available)

Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Intense Pink) 1 stone loose (multiple purchase discount available)
Sold out Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Vivid Pink) 1 stone loose (multiple purchase discount available)

Lab-grown pink diamond (2mm, synthetic pink diamond, about Fancy Vivid Pink) 1 stone loose (multiple purchase discount available)
Sold out 1 rose cut diamond (VS-SI class equivalent, 3.0mm)《Multiple purchase discount available》

1 rose cut diamond (VS-SI class equivalent, 3.0mm)《Multiple purchase discount available》

Sold out Gem Gacha💎1 special fluorescent diamond (VS-SI class equivalent, 2.0mm)

Gem Gacha💎1 special fluorescent diamond (VS-SI class equivalent, 2.0mm)

Sold out Limited to 9 stones: 1 London Blue Diamond Loose (VS-SI class equivalent, 2.0mm) Multiple purchase discounts available

Limited to 9 stones: 1 London Blue Diamond Loose (VS-SI class equivalent, 2.0mm) Multiple purchase discounts available
Sold out Diamond rough (makeable) 0.353ct rough

Diamond rough (makeable) 0.353ct rough
Sold out Diamond rough (makeable) 0.279ct rough

Diamond rough (makeable) 0.279ct rough
Sold out 南アフリカ産ダイヤモンド原石（ソーヤブル） 0.083ct原石

South African diamond rough (sawable) 0.083ct rough

Sold out ダイヤモンド 3.2mm/0.124ctルース(D, VS-2, VeryGood)

【5/30 22時販売】ダイヤモンド 3.2mm/0.124ctルース(D, VS-2, VeryGood)
Sold out ダイヤモンド 0.141ctルース(E, VVS-2, EXCELLENT)

[Posted in 32501164] Diamond 0.141ct loose (E, VVS-2, EXCELLENT)
Sold out [Sales start 5/5 10 PM JST] Limited 3 sets: 1.0ct D VS IDEAL Lab-Grown Diamond & 2 Rare Cabochon Stones (Multi-purchase discount available)

[Sales start 5/5 10 PM JST] Limited 3 sets: 1.0ct D VS IDEAL Lab-Grown Diamond & 2 Rare Cabochon Stones (Multi-purchase discount available)
Sold out Diamond 3.8mm/0.319ct Loose (F, SI-1, Princess Cut)

Diamond 3.8mm/0.319ct Loose (F, SI-1, Princess Cut)
Sold out 【32501905掲載】ブルーダイヤモンド（トリートメント） 0.801ctルース(FANCY INTENSE GREEN BLUE, SI-2)

[Lottery Sale 0521_09] Sky Blue Diamond (Treated) 0.801ct Loose (FANCY INTENSE GREEN BLUE, SI-2) with certificate

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 【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

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 【22602584掲載】【カラフリ】Pt900 ブルージルコン（ラタナキリブルー） 2.27ct リング

[On sale May 1st at 10 PM] [Colorfuri] Pt900 Blue Zircon (Ratanakiri Blue) 2.27ct/Diamond 0.28ct Ring

Sold out K18PG モルガナイト ペンダントトップ（ネックレストップ）

[On sale May 14th at 10 PM] [Colorfri] K18PG Morganite and 0.04ct Diamond Pendant Top (Necklace Top) with Appraisal Report
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 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)
Sold out 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

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

K18 Red Coral from Kochi Prefecture (0.41ct), Diamond (0.03ct) Ring
Sold out 【22602551掲載】K18 血赤珊瑚 0.56ct リング

K18 Blood Coral from Kochi Prefecture (0.56ct), Diamond (0.08ct) Ring
Sold out カナダ産ダイヤモンド原石（ソーヤブル） 0.328ct原石（トライゴン有り）

Canadian raw diamond (sawable) 0.328ct raw (with trigons)
coming soon ブラウンダイヤモンド 0.554ctルース(UNDER S(LIGHT YELLOWISH BROWN), SI-2)

[Lottery Sale 0521_03] Brown Diamond 0.554ct Loose (Color Distribution / LIGHT YELLOWISH BROWN, SI-2) Sale price¥39,800
Sold out ピンクダイヤモンド 0.073ルース(FANCY DEEP PURPLISH PINK, SI1)

Pink Diamond 0.073 Loose (FANCY DEEP PURPLISH PINK, SI1)
Sold out Pink diamond 0.030ct loose (FANCY PURPLE PINK, SI2)

Pink diamond 0.030ct loose (FANCY PURPLE PINK, SI2)
Sold out Pink diamond 0.070ct loose (FANCY INTENSE PURPLE PINK, I1)

Pink diamond 0.070ct loose (FANCY INTENSE PURPLE PINK, I1)
Sold out Diamond 2.9mm/0.094ct Loose (E, VVS2, VeryGood)

Diamond 2.9mm/0.094ct Loose (E, VVS2, VeryGood)
Sold out 【32501846掲載】ダイヤモンド 0.290ctルース(J, VS1)

0.290ct loose diamond (J, VS1, Ashoka cut)

Sold out 0.084ct loose green diamond (FANCY GRAY GREEN, I-1)

0.084ct loose green diamond (FANCY GRAY GREEN, I-1)

Sold out 【12552511掲載】ピンクダイヤモンド 0.296ctルース

Pink Diamond 0.296ct Loose (Cabochon Cut) Certificate of Authenticity
Sold out Pink Diamond 0.139ct Loose (FANCY PURPLISH PINK, I1)

Pink Diamond 0.139ct Loose (FANCY PURPLISH PINK, I1)
Sold out Canadian rough diamond (sawable) 0.099ct rough with trigon

Canadian rough diamond (sawable) 0.099ct rough with trigon
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 18K Yellow Gold American Peridot 0.339ct Diamond Ring

18K Yellow Gold American Peridot 0.339ct Diamond Ring

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 ダイヤモンド 0.126ctルース(F, VS2)

Diamond 0.126ct loose (F, VS2, octagonal cut)
Sold out 0.245ct rough diamond (with trigon)

0.245ct rough diamond (with trigon)

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.