colorless diamond

Colorless diamonds are a classic engagement ring.
It shines strongly in the light and has an exceptional beauty.
Diamonds are usually said to have a pale yellow or brown tinge, but the closer they are to colorless, the more valuable they are.
Evaluations are mainly based on global value standards called the 4Cs.
Diamond is the birthstone for April.

Round Diamond 0.389ct Loose (Cabochon Cut) Sale price¥39,800

Diamond 0.169ct loose (F, VS2) Sale price¥18,800

diamond Sale price¥45,800

Diamond (cabochon cut) 0.247ct loose (VS-SI class equivalent) Sale price¥39,800

ダイヤモンド 3.8mm/0.209ルース(G, VVS1, 3Excellent H&C)

Diamond 3.8mm/0.209 Loose (G, VVS1, 3Excellent H&C) Sale price¥59,800

Diamond (cabochon cut) 0.233ct loose Sale price¥39,800

Diamond 3.0mm/0.123ct loose stone (D, VS2, octagonal cut) Sale price¥28,800

Diamond (cabochon cut) 0.183ct loose Sale price¥24,800

Diamond 0.171ct loose stone (E, VS2, radiant cut) Sale price¥35,800

Diamond 0.128ct loose stone (cabochon cut, maroon cut) Sale price¥39,800

Diamond 0.348ct loose (I, SI1) Sale price¥59,800

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Diamond 2mm (VS class, DG color, round cut, melee diamond 2.0mm) 1 loose stone {Multiple purchase discounts available}

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「決定版アンカットダイヤモンド」サイン入り初版本＆ダイヤモンド原石（グリーン蛍光）2点セット

"Definitive Uncut Diamond" by Kyoichi Suwa, signed first edition & 2-piece set of diamonds (hexagonal cut)

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Princess cut diamond 2.0mm loose (equivalent to VS class)《Multiple purchase discount available》

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

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[On sale May 23rd at 10 PM] "Limited 9 Stones - Shinjuku Pop-Up Celebration" All stones with Central Gem Laboratory sorting (3.0-3.5mm, VS-SI clarity) "Multiple purchase discount available"

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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)

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Flawless Diamond (H&C) 4.0mm/0.266ct Loose (D, FL, 3 Excellent H&C) GIA & Chuhokan

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[Posted in 32501164] Diamond 0.141ct loose (E, VVS-2, EXCELLENT)

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Diamond 3.8mm/0.319ct Loose (F, SI-1, Princess Cut)

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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

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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

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

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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)

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

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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)

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

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Diamond 0.320ct loose (D, VS2)

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Diamond 2.9mm/0.094ct Loose (E, VVS2, VeryGood)

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

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Diamond 0.096ct loose (D, SI1, octagonal cut)

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Diamond 0.126ct loose (F, VS2, octagonal cut)

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インターナリーフローレスダイヤモンド（H&C） 4.45mm/0.305ctルース(F, IF, 3Excellent H&C) GIA&中宝

[Sale Date: 12/5 10 PM] Internally Flawless Diamond (H&C) 4.45mm/0.305ct Loose (F, IF, 3 Excellent H&C)

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インターナリーダイヤモンド 0.25ルース(E, IF, 3Excellent) GIA

Internal Diamond 4.1mm/0.250ct Loose (F, IF, 3 Excellent) GIA

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ダイヤモンド（H&C） 3.8mm/0.208ctルース(G, IF, 3Excellent H&C)

Internally Flawless Diamond (H&C) 3.8mm/0.208ct Loose Stone (G, IF, 3 Excellent H&C)

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ダイヤモンド 3.3mm/0.134ctルース(I, VVS-2, Excellent H&C)

Diamond 3.3mm/0.134ct loose stone (I, VVS-2, Excellent H&C)

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Diamond (cabochon cut) 0.401ct loose (star depending on angle)

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ダイヤモンド 0.131ctルース(G, VS-1, EXCELLENT ハート＆キューピッド)

Diamond 3.3mm/0.131ct Loose (G, VS-1, EXCELLENT Heart & Cupid)

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Diamond 0.123ct loose (bicolor)

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Diamond 0.088ct loose (bicolor)

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Zimbabwe sliced trapiche diamond 0.206ct loose

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ダイヤモンド 4.1mm/0.263ルース(I, VVS2, 3Excellent H&C)

Diamond 4.1mm/0.263 Loose (I, VVS2, 3Excellent H&C)

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ダイヤモンド 3.8mm/0.200ルース(E, VVS1, VeryGood)

Diamond 3.8mm/0.200 loose (E, VVS1, VeryGood)

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ダイヤモンド 3.8mm/0.220ルース(H, VS1, 3Excellent H&C)

Diamond 3.8mm/0.220 Loose (H, VS1, 3Excellent H&C)

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Internally Flawless Diamond 3.7mm/0.200ct Loose (E, IF, 3Excellent H&C) GIA & Chuho

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Diamond 2.7mm/0.074ct loose (E, SI2, special cut)

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.