5 major gems

coming soon

【11/28 22時販売】スリランカ産イエローサファイア 0.221ctルース Sale price¥9,800

Sold out

【11/26 22時販売】バンカチャサファイア（ブラックスターサファイア） 7.440ctルース

Sold out

【11/19 22時販売】タンザニア産バイカラーサファイア 0.363ctルース（カラーシフト）

Sold out

【11/18 22時販売】カナリーイエローダイヤモンド（トリートメント） 0.221ctルース(FANCY INTENSE YELLOW*, SI-1)

Sold out

【11/17 22時販売】タンザニア産ブルーサファイア 1.064ctルース（カラーシフト）

Sold out

【KEN氏】ファイアオパール 4mm/0.150ctルース - カラッツSTORE

[On sale 11/15 at 22:00] Mexican Fire Opal 4mm/0.150ct Loose

Sold out

[12555988] Synthetic opal 1.598ct loose stone

Sold out

【12555982掲載】メキシコ産オパール（ファセットカット） 0.454ctルース

[12555982] Mexican Opal (Faceted Cut) 0.454ct Loose

Sold out

[On sale 11/4 at 22:00] Angola green diamond rough (sawable) 0.525ct rough

Sold out

[On sale at 10pm on November 9th] Brazilian emerald in quartz 4.458ct loose stone

Sold out

[On sale at 10pm on 10/28] Mexican Hyalite Opal 0.660ct Loose

Sold out

[On sale from 10/26 at 10pm] Silky Diamond 2.8mm/0.096ct Loose

Sold out

[On sale at 10pm on 10/25] Mexican water opal 0.240ct loose stone

Sold out

ダイヤモンド 3.8mm/0.200ctルース(D, VVS-1, Excellent)

[On sale from 10/25 at 10pm] Diamond 3.8mm/0.200ct loose stone (D, VVS-1, Excellent)

Sold out

[On sale at 10pm on 10/30] Ruby 0.343ct loose

Sold out

[On sale at 10pm on 10/21] Colombian emerald rough stone 3.580ct

Sold out

[On sale at 10pm on 10/20] Non-oil emerald 1.76ct loose GIA

coming soon

Lottery sale ③_Lottery sale 1027 [12555391] Synthetic sapphire 8.533ct loose stone Sale price¥39,800

Sold out

[On sale 10/23 22:00] Mexican Cantera Opal 0.900ct Loose

Sold out

[On sale at 10pm on 10/23] Mexican Cantera Opal 1.363ct loose stone

Sold out

[On sale at 10pm on 10/23] Mexican Cantera Opal 2.303ct loose stone

Sold out

[On sale at 10pm on 10/20] Sri Lankan blue sapphire 4.5mm/0.408ct loose stone

Sold out

[On sale 11/1 22:00] Brown diamond 0.141ct loose

Sold out

[On sale 11/1 22:00] Brown diamond 0.256ct loose stone (pink fluorescent)

Sold out

[On sale from 11/1 at 22:00] Diamond (cabochon cut) 0.172ct loose

Sold out

ラボグロウンダイヤモンド（合成ダイヤモンド） 0.240ctルース(FANCY VIVID BLUE, SI1)

《Yurakucho Marui 2024112 Takeout》【Lottery Sale①】【Winners Only Page】Lab-grown Diamond (Synthetic Diamond) 0.240ct Loose (FANCY VIVID BLUE, SI1)

Sold out

Unheated Padparadscha Sapphire from Madagascar 0.340ct Loose GIA

Sold out

Montana Sapphire 0.319ct Loose (Blue Sapphire)

Sold out

Unheated Padparadscha Sapphire from Madagascar 0.290ct Loose GIA

Sold out

K18YG Pakistani Veirinite 0.061ct White Sapphire Ring

Sold out

Limited to 17 stones: Peridot green diamond (treated, VS class equivalent, 2mm) Multiple purchase discounts available

Sold out

Australian black opal 2.345ct loose

Sold out

Australian black opal 1.710ct loose

Sold out

Mexican Water Opal 7.0mm/0.787ct Loose

Sold out

Montana sapphire 0.367ct loose stone

Sold out

Blue sapphire 0.486ct loose stone

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