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treatment diamond

A diamond that takes on a color when subjected to irradiation treatment.
The biggest attraction of diamonds is that they can be purchased at a reasonable price, such as deep-hued fancy color diamonds that are traded for hundreds of millions at famous auctions around the world.
The identification document will say "treated".

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Sold out Diamond Gacha💎London Blue Diamond 1 Loose Stone (VS~SI Class, Taper Cut or Bucket Cut, Treated) {Multiple Purchase Discounts Available}
Sold out Limited to 10 stones: Blue diamond rough and loose stone set of 2 (treated) Multiple purchase discount
Sold out Limited to 9 stones Diamond Gacha💎 1 loose treated diamond (ice blue, purple, etc. / 1.7-3.0mm) Multiple purchase discount available
Sold out [Limited 2 stones/Resale] Sea green diamond (treatment) (2mm, round cut, SI class equivalent) 1 stone loose
Sold out Limited to 3 stones: 1 peridot green diamond loose stone (treated, 3mm, VS class, Chuho sorting) Multiple purchase discounts available
Sold out Limited to 2 stones: London Blue Diamond (treated) 1 loose stone (VS class equivalent, including round 3mm) Multiple purchase discounts available
Sold out ブルーダイヤモンド(トリートメント) 0.110ctルース(Fancy Light Blue Green, VVS2)
Sold out ブルーダイヤモンド(トリートメント) 0.119ctルース(Fancy Light Greenish Blue, VS2)
Sold out [On sale from 10pm on 4/20] Fancy Deep Yellowish Green Diamond (treated) 1.570ct loose (FANCY DEEP YELLOWISH GREEN, VS2) GIA
Sold out レッドダイヤモンド(トリートメント) 3.0mm/0.121ctルース(Fancy Purplish RED, SI1)
Sold out レッドダイヤモンド(トリートメント) 0.063ctルース(FANCY PURPLISH RED, SI2)
Sold out Fancy Vivid Pink Diamond (Treatment) 2mm/0.030ct Loose (FANCY VIVID PURPLISH PINK, VS-2)
Sold out Peridot green diamond (treatment) 0.071ct loose (equivalent to VS class)
Sold out  ミントグリーンダイヤモンド(トリートメント) 0.298ルース(FANCY INTENSE GREEN, VS1)
Sold out Yellow Diamond (Treatment) 2.9mm/0.089ct Loose (FANCY INTENSE GREENISH YELLOW*, VS2)
Sold out 【32501457掲載】レッドダイヤモンド(トリートメント) 0.074ctルース(FANCY PURPLISH RED, VS2)
Sold out カナリーイエローダイヤモンド(トリートメント) 0.202ctルース(FANCY VIVID YELLOW, VS-1)
Sold out ミントグリーンダイヤモンド(トリートメント) 0.097ctルース(VSクラス相当,マーキースカット)
Sold out ミントグリーンダイヤモンド(トリートメント) 0.167ctルース(VSクラス相当,プリンセスカット)
Sold out レッドブラウンダイヤモンド(トリートメント) 0.149ctルース(FANCY RED BROWN, SI1)
Sold out ロンドンブルーダイヤモンド(トリートメント) 2.5mm/0.070ctルース(VSクラス相当)
Sold out グリーンダイヤモンド(トリートメント) 0.217ctルース(FANCY DEEP GREEN, SI1)
Sold out Canary Yellow Diamond (treated) 0.221ct loose (FANCY INTENSE YELLOW*, SI-1)
Sold out Canary Yellow Diamond (Treatment) 0.218ct Loose (FANCY INTENSE YELLOW*, SI-2)
Sold out グリーンダイヤモンド(トリートメント) 0.078ctルース
Sold out ミントグリーンダイヤモンド(トリートメント) 0.101ctルース
Sold out Canary Yellow Diamond (Treatment) 0.097ct Loose (SI class equivalent)
Sold out Canary yellow diamond (treatment) 0.084ct loose (equivalent to VS class)
Sold out Diamond (treatment) 0.052ct loose (equivalent to VS class)
Sold out Mint green diamond (treatment) 0.043ct loose (equivalent to VS class)
Sold out Light mint green diamond (treatment) 2.6mm/0.074ct loose (VS-SI class equivalent)
Sold out イエローダイヤモンド(トリートメント) 0.091ルース(FANCY VIVID YELLOW, VVS2)
Sold out Yellow Diamond (Treatment) 0.363ct Loose (FANCY DEEP GREENISH YELLOW, VS-2)
Sold out カナリーイエローダイヤモンド(トリートメント) 0.248ctルース(FANCY VIVID YELLOW*, VS-1)
Sold out カナリーイエローダイヤモンド(トリートメント) 2mm/0.029ctルース(VSクラス相当)

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.

The fifth reprint has been decided and is now on sale at bookstores nationwide and online.

Written by KARATZ, book “Jewelry Illustrated Book”

The book provides explanations about over 300 types of gemstones, from new standard birthstones to rare stones that are hard to find, as well as a diary of our company representative, Mr. Koyama's, gemstone shopping experience in Thailand and Sri Lanka, and tips for photographing gemstones, allowing you to learn about the appeal of gemstones from various perspectives.