Birthstone list

Sold out

ピンクダイヤモンド 0.040ctルース(FANCY PURPLE PINK, I-1)

Pink diamond 2.1mm/0.040ct loose (FANCY PURPLE PINK, I-1)

Sold out

ダイヤモンド 0.328ctルース(VERY LIGHT YELLOW, VS1)

Diamond 0.328ct loose (VERY LIGHT YELLOW, VS1, lily cut)

Sold out

ピンクダイヤモンド 0.049ctルース(FANCY PURPLISH PINK, I-1)

Pink diamond 2.3mm/0.049ct loose (FANCY PURPLISH PINK, I-1)

Sold out

[Mr. Sanjay] Australian opal 7.1mm/0.817ct loose

Sold out

[Mr. Sanjay] Opal from Mexico 0.468ct loose

Sold out

[Mr. Sanjay] Pink tourmaline 0.551ct loose

Sold out

[Mr. Sanjay] Almandine garnet 1.519ct loose

Sold out

[Mr. Sanjay] Almandine garnet 1.192ct loose

Sold out

[Mr. Sanjay] Almandine Garnet 6.1mm/1.225ct Loose

Sold out

[Mr. Sanjay] Almandine garnet 5.6mm/0.966ct loose

Sold out

[Mr. Sanjay] Almandine garnet 6.6mm/1.576ct loose

Sold out

Almandine Garnet 7.6mm/2.197ct Loose Stone

Sold out

[Mr. Sanjay] Ice blue sapphire 6.2mm/1.009ct loose

Sold out

[Mr. Sanjay] Dragon garnet 0.829ct loose

Sold out

[Mr. Sanjay] Santa Maria Aquamarine 0.317ct loose

Sold out

Colombian trapiche emerald (reverse trapiche) 0.105ct loose

Sold out

Colombian trapiche emerald (reverse trapiche) 0.057ct loose

Sold out

Colombian trapiche emerald (reverse trapiche) 0.098ct loose

Sold out

Color change sapphire 0.378ct loose

Sold out

Bicolor sapphire from Tanzania 0.330ct loose (color shift)

Sold out

Bicolor sapphire from Tanzania 0.270ct loose (color shift)

Sold out

Bicolor sapphire from Tanzania 0.357ct loose (color shift)

Sold out

Unheated royal blue sapphire 0.28ct loose AIGS

Sold out

Unheated royal blue sapphire 0.30ct loose AIGS

Sold out

Burmese unheated pigeon blood ruby 3.6mm/0.28ct loose AIGS

Sold out

Bicolor sapphire 1.097ct loose (color shift)

Sold out

Bicolor sapphire 0.734ct loose (color shift)

Sold out

アンデシン・ラブラドライト（通称名レインボームーンストーン） 2.591ctルース

Andesine Labradorite (commonly known as Rainbow Moonstone) 2.591ct loose

Sold out

アンデシン・ラブラドライト（通称名レインボームーンストーン） 6.5mm/1.979ctルース（スフィア）

Andesine Labradorite (common name Rainbow Moonstone) 6.5mm/1.979ct Loose (Sphere)

Sold out

アンデシン・ラブラドライト（通称名レインボームーンストーン） 7mm/2.432ctルース

Andesine Labradorite (common name Rainbow Moonstone) 7mm/2.432ct loose

Sold out

Bicolor sapphire 0.671ct loose (color shift)

Sold out

Diamond 0.041ct loose (kite cut, SI class equivalent)

Sold out

Diamond 0.036ct loose (equivalent to VS class)

Sold out

ファンシーピンクダイヤモンド 0.042ctルース(FANCY PINK, I-1)

Fancy pink diamond 0.042ct loose (FANCY PINK, I-1)

Sold out

ピンクダイヤモンド 0.059ctルース(ローズカット,FANCY LIGHT PURPLE PINK, SI-1)

Pink diamond 0.059ct loose (rose cut, FANCY LIGHT PURPLE PINK, SI-1)

Sold out

奈良県天川村産レインボーガーネット（アンドラダイトガーネット） 0.879ctルース

Rainbow garnet (andradite garnet) from Tenkawa Village, Nara Prefecture 0.879ct loose

Sold out

[Koshu Precious Stones Plusthree] Sky Blue Topaz 4.415ct Loose

Sold out

Unheated ruby from Madagascar 0.315ct loose (with black rutile)

Sold out

Unheated ruby from Madagascar 0.355ct loose (with black rutile)

Sold out

Bicolor tourmaline cat's eye 5.014ct loose

Sold out

Santa Maria Aquamarine 0.240ct loose

Sold out

Bicolor sapphire 0.493ct loose

Sold out

Cornflower Blue Sapphire 5mm/0.680ct Loose AIGS

Sold out

Unheated royal blue sapphire 0.470ct loose AIGS

Sold out

Unheated Royal Blue Sapphire 1.690ct Loose AIGS

Sold out

Pigeon blood ruby 0.900ct loose AIGS

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