Birthstone list

ダイヤモンド 4.3mm/0.310ctルース(D, VS1, Excellent) GIA

[Lottery Sale 0707_02] Diamond 0.310ct Loose (D, VS1, Excellent) GIA Sale price¥89,800

Pt900 ブラックダイヤモンド 1.00ct・ダイヤモンド0.50ctリング鑑別書

[Lottery Sale 12][For Winners Only][Posted on 22602618] Pt900 Black Diamond 1.00ct / Diamond 0.50ct Ring Sale price¥158,000

[On sale July 20th at 10 PM] "Limited to 13 Stones" Diamond Gacha: Win a FANCY VIVID Yellow Diamond (with sorting report) worth 22,800 yen. One loose stone. (Multiple purchase discount available.) Sale price¥3,980

[Published on 22602652] [Colorful] K18 Synthetic Opal Pendant Top Sale price¥19,800

K18 グロッシュラーガーネット 0.26ctct ペンダントトップ（ネックレストップ）

[22602626 listed] [Kalafr] K18 Grossular Garnet 0.26ct Charm Sale price¥39,800

[Sales begin July 24 at 10 PM] Limited 5 Stones: Moonstone from Mitiyagoda, Sri Lanka (June Birthstone, Round Buff-Top Cut, 4.0mm) - 1 Loose Stone [Multiple Purchase Discount Available] Sale price¥5,980

[Listed on 12563726] Sri Lankan Purple Sapphire 0.661ct Loose Stone Sale price¥59,800

マラウイ産ピンクサファイア（マラウイサファイア） 3.0mm/0.128ctルース

[Listed as 12563467] Malawi sapphire 0.128ct loose stone Sale price¥18,800

[Posted on 32501949] Diamond 0.310ct Loose Stone (E, VS1, 3Excellent) GIA Sale price¥88,800

0.522ct bicolor sapphire loose stone from Madagascar Sale price¥6,980

[Listed as 12563731] Brazilian Indicolite Tourmaline 0.404 ct Loose Stone Sale price¥39,800

[Posted on 12563480] Madagascar Teal Green Sapphire 0.470ct Loose Stone Sale price¥29,800

[Listed as 12563246] Mexican Fire Opal 1.115ct Loose Sale price¥25,800

[On sale July 31, 10 PM JST] Madagascar Padparadscha Sapphire 3.5mm/0.234ct Loose Stone with Central Gemological Laboratory certificate Sale price¥49,800

[On sale July 28th at 10 PM] Madagascar Paparadscha Sapphire 4.0mm/0.305ct Loose Stone with Central Gem Lab Report Sale price¥67,800

[On sale July 26th at 10 PM] Madagascar Padparadscha Sapphire 3.4mm/0.208ct Loose Stone with Central Gem Lab Certificate Sale price¥45,800

[Available 7/28 10 PM JST] Colombian Emerald, 4.5mm/0.286ct Loose Gemstone, Hoki-kyo Sale price¥69,800

【Sales start: July 30, 10 PM JST】Tanzanian Bi-Color Grossular Garnet 0.319ct Loose Stone Sale price¥19,800

【7/29 10 PM Sale】Colombian Emerald Cat's Eye 0.060ct Loose Stone (Houseki Kyo Appraisal) Sale price¥15,800

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） 3.9mm/0.378ctルース（ローズカット）

[On Sale July 24 at 10 PM] Nara Prefecture, Tenkawa Village Rainbow Garnet (Andradite Garnet) 3.9mm/0.378ct Loose Stone (Rose Cut) Sale price¥9,800

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） 0.240ctルース

[On Sale 7/27 10 PM] Nara Prefecture, Tenkawa Village Rainbow Garnet (Andradite Garnet) 3.5mm/0.240ct Loose Stone Sale price¥8,800

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） 0.336ctルース

[On Sale 7/27 10 PM] Rainbow Garnet (Andradite Garnet) from Tenkawa Village, Nara Prefecture 3.8mm/0.336ct Loose Stone Sale price¥9,800

[On sale July 28th at 10 PM] Colombia Cosquez Trapiche Emerald 0.184ct Loose, with identification certificate Sale price¥25,800

[On sale July 28, 10 PM JST] Colombia, Cosquez Trapiche Emerald, 0.157 ct Loose Stone with Certificate Sale price¥22,800

[Sales Start: July 25th, 10 PM JST] Colombia Cosquez Mine Trapiche Emerald 0.138ct Loose Stone with Certification Sale price¥19,800

[Sale starts July 25th at 10 PM] Colombian Cosquez Mine Trapiche Emerald 0.144ct Loose Stone with Certification Sale price¥22,800

[On Sale 7/25 at 10 PM JST] Colombia Cosquez Mine Trapiche Emerald 0.177ct Loose Stone with Certificate Sale price¥29,800

【Sales start July 29, 10 PM】[Colorfle] Pt900 Ruby 0.69ct, Diamond 0.16ct Ring with appraisal report Sale price¥188,000

Pt850/K14WG アップルグリーンダイヤモンド0.38ct・ダイヤモンド0.50ct ピアス鑑別書

[On sale July 30, 10 PM] [Colorfri] Pt850/K14WG Apple Green Diamond 0.38ct / Diamond 0.50ct Earrings with appraisal report Sale price¥98,000

[Sales begin 7/31 10 PM JST] [Colorflee] K18WG Diamond 0.30ct Earrings Sale price¥29,800

Pt900/K18WG ダイヤモンド0.50ct ・ダイヤモンド0.07ctペンダント（ネックレス）

[On Sale 7/29 10 PM] [COLORFULI] Pt900/K18WG 0.50ct Diamond / 0.07ct Diamond Pendant (Necklace) Sale price¥89,800

Pt900/Pt850 ダイヤモンド 4.0mm/0.29ct 一粒ペンダント（ネックレス）

[On Sale 7/26 at 10 PM] [Colorfri] Pt900/Pt850 Diamond 4.0mm/0.29ct Solitaire Pendant (Necklace) Sale price¥35,800

ダイヤモンド 3.0mm/0.105ctルース(F, VVS2, VeryGood)

[On sale 10 PM, July 26] Diamond 3.0mm/0.105ct Loose Stone (F, VVS2, VeryGood) Sale price¥19,800

ダイヤモンド（ハート＆キューピッド）3.0mm/0.226ctルース(G, VVS-1, 3Excellent H&C)

[On sale 10 PM, July 26] Diamond (Hearts & Arrows) 3.0mm/0.226ct Loose (G, VVS-1, 3Excellent H&C) Sale price¥46,800

ピンクダイヤモンド 2.2mm/0.044ctルース(FANCY LIGHT PURPLE PINK, SI1)

[On sale July 26, 10 PM] Pink Diamond 2.2mm/0.044ct Loose (FANCY LIGHT PURPLE PINK, SI1) Sale price¥39,800

ピンクダイヤモンド 0.073ctルース(FANCY LIGHT PURPLE PINK, SI2)

[On Sale July 31, 10 PM JST] Pink Diamond 0.073ct Loose (FANCY LIGHT PURPLE PINK, SI2) Sale price¥39,800

Pt900 インペリアルトパーズ 3.88ct・ダイヤモンド0.26ct リング鑑別書

[Sales start July 29, 10 PM JST] [COLORFUL] Pt900 Imperial Topaz 3.88ct / Diamond 0.26ct Ring with Appraisal Report Sale price¥258,000

[Listed as 12562727] Pink Imperial Topaz 1.907ct Loose Stone Sale price¥118,000

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） 3.219ctルース

[On sale July 26th at 10 PM] Nara Prefecture, Tenkawa Village Rainbow Garnet (Andradite Garnet) 3.219ct Loose Stone Sale price¥24,800

[On sale July 26th at 10 PM] Nepali Kyanite 2.461ct Loose Stone Sale price¥12,800

Pt900 アコヤ真珠（アコヤパール）10.2mm・ダイヤモンド0.23ctリング鑑別書

[Published in 22602657] [Colorful] Pt900 Akoya Pearl Ring Sale price¥98,000

[Lottery Sale 0521_08] Madagascar Sapphire 1.650ct Loose GIA Sale price¥158,000

[On sale July 29, 10 PM] Sri Lankan White Sapphire 1.025ct Loose Stone with Certification Sale price¥35,800

[Posted on 12563995] Australian Black Opal 0.702 ct Loose Stone Sale price¥29,800

[Listed as 12563997] 0.107ct Colombian Emerald Loose Stone Sale price¥12,800

[Listed in 12564013] Madagascar Blue Sapphire 0.662ct Loose Sale price¥18,800

[On sale 7/30 at 10 PM] Nigerian Mandarin Garnet 0.750 ct Loose Stone with Gemstone Identification Report Sale price¥22,800

[Posted as 12563944] Colombian Trapiche Emerald 0.252ct Loose Stone Sale price¥35,800

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.