Birthstone list

[Sale from 10 PM on 5/5] [Colorful] K18 Sphene 0.7ct and Diamond 0.03ct Ring with Certification Sale price¥79,800

[On sale May 9 at 10 PM JST] Brazilian Sky Blue Topaz 0.802ct Loose Stone Sale price¥9,800

[Sale from 10 PM on May 17th] [Colorful] K18WG Diamond 0.21ct Pendant Top (Necklace) Sale price¥49,800

[On sale May 23 at 10 PM] [Colorfully] K18 Diamond 0.3ct Pendant Top (Necklace Top) Sale price¥39,800

[On sale 5/23 at 10 PM] [Colorful] K18WG Diamond 0.126ct Pendant (Necklace) Sale price¥49,800

[Sales begin May 18 at 10 PM JST] [Colorflee] Pt900 Diamond 0.50ct Ring Sale price¥79,800

[Sale on 5/23 at 10 PM JST] Brazilian Paraiba Tourmaline 0.170ct Loose Stone (CuO: 2.1%, MnO: 1.1%) Sale price¥258,000

【Available 5/9 at 10 PM JST】Brazilian Sky Blue Topaz 0.756ct Loose Gemstone 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） 0.656ctルース

【Sale from 10 PM on May 23】Nara Prefecture Tenkawa Village Rainbow Garnet (Andradite Garnet) 4.8mm/0.656ct Loose Stone Sale price¥11,000

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） 2.678ctルース

[Sale on May 26th at 10 PM] Rainbow Garnet (Andradite Garnet) from Tenkawa Village, Nara Prefecture 7.4mm/2.678ct Loose Stone Sale price¥15,800

[On sale May 10th at 10 PM] Tanzanian Tanzanite 0.406ct Loose Stone Sale price¥12,800

[Sales begin May 10, 10 PM JST] Afghanistan Lapis Lazuli 9.7mm / 3.268ct Loose Stone (Rose Cut) Sale price¥12,800

[On Sale May 9th at 10 PM JST] Australian Opal with Matrix, 14.840ct, Loose Stone, Gemstone Report Sale price¥69,800

ブラジル産トリカラートルマリン 32.207ctルース (パーティカラートルマリン）

[On sale May 10th at 10 PM] Brazilian Tricolor Tourmaline 32.207ct Loose Stone (Parti-color Tourmaline) Sale price¥398,000

[On sale May 23rd at 10 PM] Diamond 3.4mm/0.141ct Loose Stone (E, VVS-2, EXCELLENT, H&C) Sale price¥36,800

フローレスダイヤモンド（H&C） 0.210ctルース(D, FL, 3Excellent H&C)

[On sale May 12, 10 PM JST] Flawless Diamond (H&C) 3.8mm/0.210ct Loose (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥148,000

フローレスダイヤモンド（H&C） 0.230ctルース(D, FL, 3Excellent H&C)

[On sale May 12, 10 PM JST] Flawless Diamond (H&C) 4.0mm/0.230ct Loose Stone (D, FL, 3Excellent H&C) GIA&CGL Sale price¥158,000

インターナリーフローレスダイヤモンド 0.300ctルース(F, IF, 3Excellent)

[Sale on May 12th at 10 PM] Internally Flawless Diamond 4.3mm/0.300ct Loose (F, IF, 3Excellent) GIA Sale price¥98,000

インターナリーフローレスダイヤモンド（H&C） 0.360ctルース(D, IF, 3Excellent H&C)

[On sale May 12th, 10 PM JST] Internally Flawless Diamond (H&C) 4.5mm/0.360ct Loose Stone (D, IF, 3Excellent H&C) GIA & CBT Sale price¥188,000

[On sale May 12, 10 PM JST] Tanzanian Lavender Tanzanite 1.415ct Loose Stone Sale price¥45,800

[On sale May 12th at 10 PM] Tanzanian Tanzanite 4.1mm/0.295ct Loose Gemstone Sale price¥9,800

[On sale May 12th, 10 PM JST] Mexican Fire Opal (Faceted) 1.046ct Loose Stone Sale price¥29,800

[On Sale May 12th at 10 PM] Bi-Color Grossular Garnet from Tanzania, 2.057 ct, Loose Stone Sale price¥55,800

[On sale May 13th at 10 PM] Brazilian Limonite in Topaz 7.141ct Loose Gemstone Sale price¥19,800

マダガスカル産ベキリーブルーガーネット（カラーチェンジガーネット） 0.082ctルース

[On sale May 12th at 10 PM] Madagascar Bekily Blue Garnet (Color Change Garnet) 0.082ct Loose Stone Sale price¥8,800

【Sales start 5/13 10 PM JST】Sri Lankan Bi-Color Sapphire, 0.434 ct Loose Stone Sale price¥12,800

[On sale May 14 at 10 PM] Colorful WISH UPON A STAR® 3.5mm/0.166ct/F/VS1 Diamond with Certificate Sale price¥39,800

[On Sale May 22 at 10 PM JST] Australian Black Opal 1.393ct Loose Stone Sale price¥48,800

[On sale 5/22 at 10 PM] Australian Black Opal 0.325ct Loose Stone Sale price¥9,800

[Sale on May 24th at 10 PM JST] Australian Black Opal 0.216ct Loose Sale price¥11,000

[Sale starts May 21st, 10 PM JST] Brazilian Rose Amethyst 6.325ct Loose Gemstone Sale price¥12,800

【Sold from 22:00 on May 21】Brazilian Color-Shift Amethyst 6.559ct Loose Stone Sale price¥15,800

[Sale at 10 PM on May 22] GGG (Gadolinium Gallium Garnet) 0.511 ct Loose Stone Sale price¥12,800

[On sale May 24th, 10 PM JST] Brazilian Color-Shift Amethyst 1.865ct Loose Gemstone Sale price¥9,800

Pt900 ダイヤモンド 0.65ctct ペンダントトップ（ネックレストップ）

[Colorful] Pt900 Diamond 0.65ct Pendant Top Sale price¥89,800

[On sale May 30th at 10 PM] [Colorfri] K18 Synthetic Ruby / Synthetic Spinel Pendant Top (Necklace Top) with Certificate of Authenticity Sale price¥98,000

Pt900 アイスブルーダイヤモンド（トリートメント） 0.256ctct ペンダント（ネックレス）

[On Sale 5/26 at 10 PM] Colorful Pt900 Ice Blue Diamond (Treated) 0.256ct / Diamond 0.06ct Pendant (Necklace) Sale price¥98,000

Pt900 ブラジル産パライバトルマリン 0.06ct ペンダント（ネックレス）

[On sale 5/26 10 PM] [Colorful] Pt900 Paraiba Tourmaline from Brazil 0.06ct / Diamond 0.18ct Pendant Top (CuO:2.6%, MnO:3.5%) Sale price¥69,800

[On sale May 26th, 10 PM] Colorful K18WG Diamond 0.40ct Pendant (Necklace) Sale price¥79,800

Pink tourmaline 0.466ct loose Sale price¥8,800

Pink tourmaline 6.1mm/1.031ct loose stone Sale price¥12,800

Mozambique Pink Sapphire 0.276ct Loose (Hot Pink Sapphire) Sale price¥9,800

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） 3.251ctルース

Andesine Labradorite (also known as Rainbow Moonstone) 7.7mm/3.251ct Loose Stone (Sphere) Sale price¥29,800

Salt and pepper diamond 0.446ct loose Sale price¥39,800

Colombian oil-free emerald 0.310ct loose stone Sale price¥298,000

Non-Oil Emerald 1.370ct Loose GIA Sale price¥1,580,000

Colombian Trapiche emerald 0.611ct rough stone Sale price¥59,800

Tanzanian Chrome Tourmaline 0.522ct Loose Stone Sale price¥3,980

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.