Birthstone list

Brazilian Romanesite in Amethyst 7.083ct Loose Stone Sale price¥15,800

Brazilian Paraiba Tourmaline 0.038ct Loose Stone (CuO:1.3%, MnO:2.7%) Sale price¥35,800

Brazilian Paraiba Tourmaline 0.041ct Loose (CuO:1.9%, MnO:4.3%) Sale price¥39,800

Brazilian Paraiba Tourmaline 0.038ct Loose Stone (CuO:1.6%, MnO:2.8%) Sale price¥45,800

Paraiba Tourmaline from Brazil 0.037ct loose stone (CuO:1.4%, MnO:2.6%) Sale price¥25,800

Brazilian Paraiba Tourmaline 0.050ct Loose Stone (CuO:1.9%, MnO:3.6%) Sale price¥39,800

Paraiba Tourmaline from Brazil, 0.039ct loose stone (CuO:1.6%, MnO:2.9%) Sale price¥35,800

0.035ct loose Brazilian Paraiba Tourmaline (CuO:1.6%, MnO:3.3%) Sale price¥29,800

Brazilian Aquamarine 68.088ct Loose Stone with Gem Identification Report Sale price¥39,800

Brazilian Emerald Cat's Eye 0.459ct Loose Stone with Certification Sale price¥9,800

Brazilian Emerald Cat's Eye 1.022ct Loose Stone with Appraisal Sale price¥12,800

Australian Boulder Opal 41.775 ct Loose Stone Sale price¥19,800

Australian Boulder Opal 12.216ct Loose Sale price¥15,800

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

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

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

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

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

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

Pink tourmaline 0.466ct loose Sale price¥8,800

[Karafuri] K18WG Diamond 0.40ct Pendant (Necklace) Sale price¥79,800

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）

[Colorful] Pt900 Paraiba Tourmaline 0.06ct from Brazil and Diamond 0.18ct Pendant Top (CuO:2.6%, MnO:3.5%) Sale price¥69,800

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）

【Colorful】Pt900 Treated Ice Blue Diamond 0.256ct / Diamond 0.06ct Pendant (Necklace) Sale price¥98,000

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

Brazilian Color-Shift Amethyst, 1.865 ct Loose Sale price¥9,800

GGG (Gadolinium Gallium Garnet) 0.511 ct Loose Stone Sale price¥12,800

Brazil Color Change Amethyst 6.559ct Loose Stone Sale price¥15,800

Brazil Rose Amethyst 6.325ct Loose Gemstone Sale price¥12,800

Australian black opal 1.393ct loose Sale price¥48,800

Sri Lankan Bi-Color Sapphire 0.434ct Loose Stone Sale price¥12,800

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

0.082ct Madagascar Bekily Blue Garnet (Color Change Garnet) Loose Gemstone Sale price¥8,800

Brazilian Limonite in Topaz 7.141ct Loose Sale price¥19,800

Tanzanian Bi-Color Grossular Garnet 2.057ct Loose Stone Sale price¥55,800

Mexican Fire Opal (Faceted) 1.046ct Loose Gemstone Sale price¥29,800

Tanzanian Tanzanite 4.1mm/0.295ct Loose Stone Sale price¥9,800

1.415ct Loose Tanzanian Lavender Tanzanite Sale price¥45,800

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)

Internally Flawless Diamond (H&C) 4.5mm/0.360ct Loose (D, IF, 3Excellent H&C) GIA & CBT Sale price¥188,000

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)

Internally Flawless Diamond 4.3mm/0.300ct Loose (F, IF, 3Excellent) GIA Sale price¥98,000

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

Flawless Diamond (H&C) 4.0mm/0.230ct Loose Stone (D, FL, 3Excellent H&C) GIA & Central Gem Sale price¥158,000

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

Flawless Diamond (H&C) 3.8mm/0.210ct Loose (D, FL, 3Excellent H&C) GIA & Central Gem Lab Sale price¥148,000

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）

Brazilian Tricolor Tourmaline 32.207ct Loose (Parti-color Tourmaline) Sale price¥398,000

Australian Opal with Matrix (14.840ct Loose Stone) with Certificate Sale price¥69,800

Tanzanian Tanzanite 0.406ct Loose Stone Sale price¥12,800

Brazilian Sky Blue Topaz, 0.756 ct, loose stone Sale price¥8,800

Brazilian Paraiba Tourmaline 0.170ct Loose Stone (CuO: 2.1%, MnO: 1.1%) Sale price¥258,000

[Colorfyl] K18WG Diamond 0.126ct Pendant (Necklace) Sale price¥49,800

[Calafull] K18 Diamond 0.3ct Pendant Top (Necklace Top) Sale price¥39,800

【Calafuri】K18WG Diamond 0.21ct Pendant Top (Necklace) Sale price¥49,800

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.