blue diamond

A diamond with a blue hue. There are extremely few naturally blue ones, and they are highly valued as rare items. The ones you see on the market are those whose color has been changed through irradiation treatment. Diamond is the birthstone for April.

Karatz GemMagazine
" Blue Diamond "

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[On sale from 10pm on March 20th] Limited to 10 stones, 1 London Blue Diamond Loose (VS-SI class equivalent, 1.8mm) [Multiple purchase discounts available]

[On sale from 10pm on March 20th] Limited to 10 stones, 1 London Blue Diamond Loose (VS-SI class equivalent, 1.8mm) [Multiple purchase discounts available] Sale price¥1,980
[On sale from 10pm on March 16th] Limited to 9 stones, 1 London Blue Diamond loose (VS-SI class equivalent, 2.0mm) [Multiple purchase discounts available]

[On sale from 10pm on March 16th] Limited to 9 stones, 1 London Blue Diamond loose (VS-SI class equivalent, 2.0mm) [Multiple purchase discounts available] Sale price¥2,980
Ice blue diamond 1.2mm or 2.0mm 1 stone (VS class equivalent, round cut) {Multiple purchase discount available}

Ice blue diamond 1.2mm or 2.0mm 1 stone (VS class equivalent, round cut) {Multiple purchase discount available} Sale priceFrom ¥4,980
Lab-grown ice blue diamond set of two (synthetic diamond, VS class equivalent, 1mm) {Multiple purchase discount available}

Lab-grown ice blue diamond set of two (synthetic diamond, VS class equivalent, 1mm) {Multiple purchase discount available} Sale price¥1,580
[On sale from 10pm on 2/11] Diamond Gacha💎1 London Blue Diamond Loose (VS~SI class equivalent, taper cut or bucket cut, treated) {Multiple purchase discounts available}

[On sale from 10pm on 2/11] Diamond Gacha💎1 London Blue Diamond Loose (VS~SI class equivalent, taper cut or bucket cut, treated) {Multiple purchase discounts available} Sale price¥1,280
[On sale at 10pm on 2/22] {Limited to 12 pieces} Diamond Gacha💎1 London Blue Diamond Loose (VS class equivalent, 2.0~3.2mm) {Multiple purchase discounts available}

[On sale at 10pm on 2/22] {Limited to 12 pieces} Diamond Gacha💎1 London Blue Diamond Loose (VS class equivalent, 2.0~3.2mm) {Multiple purchase discounts available} Sale price¥5,980
[On sale from 10pm on 2/24] {Limited to 7 stones} Diamond Gacha💎 Ice blue diamond (equivalent to VS-SI class, 2-2.7mm) 1 loose stone {Multiple purchase discounts available}

[On sale from 10pm on 2/24] {Limited to 7 stones} Diamond Gacha💎 Ice blue diamond (equivalent to VS-SI class, 2-2.7mm) 1 loose stone {Multiple purchase discounts available} Sale price¥4,980
アイスブルーダイヤモンド（トリートメント） 3.2mm/0.127ctルース(LIGHT BLUE, VS2)

[32501791] Blue Diamond (treated) 0.127ct loose (LIGHT BLUE, VS2) Sale price¥25,800
Pt900アイスブルーダイヤモンド0.333ct 0.333ct ピアス

Pt900 ice blue diamond 0.333ct/0.333ct earrings Sale price¥98,000
Pt950ベニトアイト0.10ct・アクアマリン・ブルーダイヤモンドリング - カラッツSTORE

Pt950 Benitoite 0.10ct Aquamarine Blue Diamond Ring Sale price¥98,000
Sold out Diamond gacha 💎Diamond gacha (treatment) where you can win a 12 stone set of color rings, ice blue diamonds, and purple diamonds (discount for multiple purchases available) [3,980 yen]

Diamond gacha 💎Diamond gacha (treatment) where you can win a 12 stone set of color rings, ice blue diamonds, and purple diamonds (discount for multiple purchases available) [3,980 yen]

Sold out Diamond gacha💎Diamond gacha (treatment) where you can win purple diamonds and ice blue diamonds (multiple purchase discount available)

Diamond gacha💎Diamond gacha (treatment) where you can win purple diamonds and ice blue diamonds (multiple purchase discount available)

Sold out Limited to 10 stones: Blue diamond rough and loose stone set of 2 (treated) Multiple purchase discount

Limited to 10 stones: Blue diamond rough and loose stone set of 2 (treated) Multiple purchase discount
Sold out [On sale from 22:00 on 2/8] 1 deep blue diamond (SI-I class equivalent, 4-4, 2mm, average 0.29ct, treated) {Multiple purchase discount}

[On sale from 22:00 on 2/8] 1 deep blue diamond (SI-I class equivalent, 4-4, 2mm, average 0.29ct, treated) {Multiple purchase discount}

Sold out Gem Gacha💎 Ice Blue Diamond, Moss Green Diamond, London Blue Diamond, etc. (1.8-4.2mm, Treated)

Gem Gacha💎 Ice Blue Diamond, Moss Green Diamond, London Blue Diamond, etc. (1.8-4.2mm, Treated)

Sold out Limited to 2 stones: London Blue Diamond (treated) 1 loose stone (VS class equivalent, including round 3mm) Multiple purchase discounts available

Limited to 2 stones: London Blue Diamond (treated) 1 loose stone (VS class equivalent, including round 3mm) Multiple purchase discounts available

Sold out アイスブルーダイヤモンド 0.099ctルース（VSクラス相当,マーキースカット）

Ice blue diamond 0.099ct loose (VS class equivalent, marquise cut)

Sold out Winter color gemstone 13 stone set (Santamari aquamarine, tanzanite, ice blue diamond, indigo tourmaline) half eternity ring set (2.0mm)

Winter color gemstone 13 stone set (Santamari aquamarine, tanzanite, ice blue diamond, indigo tourmaline) half eternity ring set (2.0mm)
Sold out アイスブルーダイヤモンド 0.060ctルース

Ice blue diamond 0.060ct loose
Sold out アイスブルーダイヤモンド 0.055ctルース

Ice blue diamond 0.055ct loose (VS class equivalent, heart shape)
Sold out アイスブルーダイヤモンド 0.053ctルース

Ice blue diamond 0.053ct loose (VS class equivalent, heart shape)
Sold out K18ブラジル産パライバトルマリン0.588ct ペンダント（ネックレス）

K18 Brazilian Paraiba Tourmaline 0.588ct, Blue Diamond, Paraiba Tourmaline Pendant (Necklace)
Sold out K18ブラジル産パライバトルマリン0.20ct・ブルーダイヤモンド リング

K18 Brazilian Paraiba Tourmaline 0.20ct Blue Diamond Ring
Sold out アイスブルーダイヤモンド 0.051ctルース

Ice blue diamond 0.051ct loose (equivalent to VS class)
Sold out アイスブルーダイヤモンド 0.064ctルース

Ice blue diamond 0.064ct loose (SI class equivalent)
Sold out 【カラフリ】K18WGブルーダイヤモンド（トリートメント）0.11ct ピアス - カラッツSTORE

[Colorful] K18WG blue diamond (treatment) 0.11ct earrings

Sold out K18ベニトアイト0.11ct・アイスブルーダイヤモンド・パライバトルマリンリング - カラッツSTORE

K18 Benitoite 0.11ct/Ice Blue Diamond/Paraiba Tourmaline Ring

Sold out Pt950スピネル0.23ct・ブルーダイヤモンド・ガーナイト ピンキーリング - カラッツSTORE

Pt950 spinel 0.23ct/blue diamond/garnite pinky ring

Sold out ブルーダイヤモンド（トリートメント） 0.653ctルース(FANCY DEEP GREENISH BLUE*, SI-2)

London Blue Diamond (Treatment) 0.653ct Loose (FANCY DEEP GREENISH BLUE, SI-2)

Sold out アイスブルーダイヤモンド2石セット 2mm/0.076ctルース（VSクラス相当）

Ice blue diamond 2 stone set 2mm/0.076ct loose (VS class equivalent)

Sold out ロンドンブルーダイヤモンド（トリートメント） 2.4mm/0.060ctルース（VSクラス相当）

London Blue Diamond (Treatment) 2.4mm/0.060ct Loose (VS class equivalent)

Sold out アイスブルーダイヤモンド 2.5mm/0.067ctルース（VSクラス相当）

Ice blue diamond 2.5mm/0.067ct loose (equivalent to VS class)

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）

London Blue Diamond (Treatment) 2.5mm/0.070ct Loose (VS class equivalent)

Sold out ロンドンブルーダイヤモンド（トリートメント）2石セット 2.3mm/0.123ctルース（VSクラス相当）

London Blue Diamond (Treatment) 2 stone set 2.3mm/0.123ct loose (VS class equivalent)

Sold out アイスブルーダイヤモンド 0.097ctルース(FANCY GREENISH BLUE, VS-1)

Ice blue diamond 2.9mm/0.097ct loose (FANCY GREENISH BLUE, VS-1)

Sold out アイスブルーダイヤモンド 4.2mm/0.277ctルース(FANCY LIGHT GREENISH BLUE, SI-1)

Ice blue diamond 4.2mm/0.277ct loose (FANCY LIGHT GREENISH BLUE, SI-1)

Sold out アイスブルーダイヤモンド 0.108ctルース（VSクラス相当,マーキースカット）

Ice blue diamond 0.108ct loose (VS class equivalent, marquise cut)

Sold out Ice blue diamond 2.3mm/0.069ct loose (VS class equivalent, princess cut)

Ice blue diamond 2.3mm/0.069ct loose (VS class equivalent, princess cut)

Sold out アイスブルーダイヤモンド 0.068ctルース

Ice blue diamond 0.068ct loose (VS class equivalent, princess cut)

Sold out アイスブルーダイヤモンド 0.040ctルース（VSクラス相当,マーキースカット）

Ice blue diamond 0.040ct loose (VS class equivalent, marquise cut)

Sold out アイスブルーダイヤモンド 0.040ctルース（VSクラス相当,マーキースカット）

Ice blue diamond 0.040ct loose (VS class equivalent, marquise cut)

Sold out アイスブルーダイヤモンド 0.066ctルース（VSクラス相当,プリンセスカット）

Ice blue diamond 0.066ct loose (VS class equivalent, princess cut)

Sold out アイスブルーダイヤモンド 0.040ctルース（VSクラス相当,プリンセスカット）

Ice blue diamond 0.040ct loose (VS class equivalent, princess cut)

Sold out アイスブルーダイヤモンド 0.037ctルース（VSクラス相当,プリンセスカット）

Ice blue diamond 0.037ct loose (VS class equivalent, princess cut)

Sold out アイスブルーダイヤモンド 2.7mm/0.093ctルース（VSクラス相当,ラウンドカット）

Ice blue diamond 2.7mm/0.093ct loose (VS class equivalent, round 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.

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.

KARATZ・Five Commitments