5 major gems

Limited to 14 stones: Lab-grown diamond (cabochon cut, approximately 2.3mm) - 1 loose stone. Discounts available for multiple purchases. Sale price¥4,980

Diamond loose sorting transition fee Sale price¥3,000

"Limited to 14 stones" Fluorescent diamonds in rare colors such as white, orange, and green "Bulk purchase discounts available" Sale price¥3,980

Tucson New Arrivals / Limited to 28 Stones: Australian Andamooka Black Matrix Opal (Carbon Treated) 1 Loose Stone (Multi-purchase Discount Available) Sale price¥3,980

《New Tucson Arrivals - Limited to 13 Stones》Mexican Opal, including B-grade stones (Egg-in-Opal and Water Opal) 《Multiple Purchase Discount Available》 Sale price¥2,980

Limited quantity: 1 impregnated ruby loose (4mm, round cut, identification instructions included) Multiple purchase discounts available Sale price¥1,980

Limited to 9 sets: Sri Lankan sapphire (3.0-3.5mm, round cut) and Sri Lankan glass body set of 2 stones. Discounts available for multiple purchases. Sale price¥5,980

Kyanite from Nepal, 1 loose stone (indigo blue color, 4 x 6 mm, emerald cut) {Multiple purchase discount available} Sale price¥2,980

Limited to 13 stones: Mexican Opal (Cabochon Cut) Gacha (Multiple purchase discounts available) Sale price¥2,980

Limited to 6 stones: 1 loose, unheated silky pink sapphire from Vietnam (milky pink sapphire) Multiple purchase discounts available Sale price¥5,980

《Limited to 11 Stones》Rouge Cut & Heart Shaped Gemstone Gacha Usually ¥18,800💎 Almandine Garnet, Pink Tourmaline, Scolite, Sapphire《Multiple Purchase Discount Available》 Sale price¥4,980

《Limited to 5 stones》Fluorescent brown diamond single loose stone (pear shape, SI clarity equivalent, 0.2ct UP) 《Bulk purchase discount available》 Sale price¥4,980

Tucson New Arrivals / Limited 18 Pieces / Peruvian Blue Opal, 1 piece / Bulk Purchase Discount Available Sale price¥3,980

《Limited to 10 Stones》Diamond Gacha💎 with Gemstone Sorting (0.136ct/E/VVS-2/EXCELLENT/NONE (Heart & Cupid)) up for grabs 《Multiple purchase discount available》 Sale price¥3,980

Limited to 11 stones: Sakura-shaped Contralus Opal and a specially cut Opal Gacha with one loose stone. Discounts available for multiple purchases. Sale price¥3,980

Limited to 14 stones: 3mm single unheated sapphire from the Theppanawa mine in Sri Lanka. Discounts available for multiple purchases. Sale price¥5,980

Limited to 8 stones: 1 loose kite cut stone (illusion sunstone, sapphire, emerald, spessartine garnet, etc.) Multiple purchase discounts available Sale price¥5,980

Limited to 10 stones: 1 unheated yogo sapphire rough stone. Discounts available for multiple purchases. Sale price¥5,980

[Sale 6/] 10:00 PM - Limited 11 Stones - Sri Lankan Pink Sapphire (Emerald Cut) Average 0.73ct (Multiple Purchase Discount Available) Sale price¥5,980

"7-Piece Limited Edition" Mexican Opal, up to 11ct, including some with minor flaws. Multiple purchase discount available. Sale price¥3,980

Limited to 10 stones: Unheated Sapphire (3.5mm, Round Cut) from the Theppanawa Mine, Sri Lanka. Single loose stone. Discounts available for multiple purchases. Sale price¥4,980

[Limited to 6 stones] Contains 2 stones in total: 1 gemstone (rough stone) that is actually featured in a gemstone encyclopedia + 1 emerald rough stone. Sale price¥4,980

Limited to 8 stones: 1 Mexican fire opal loose stone with unique color (up to 2.2ct) Multiple purchase discounts available Sale price¥3,980

13-stone diamond half eternity ring set (VS class, D-G color, H&C, 2.0mm) Sale price¥158,000

Limited to 7 stones: 1 loose Australian iron opal (average 7ct, October birthstone opal) Multiple purchase discounts available Sale price¥4,980

Limited to 23 stones: Ethiopian Opal, 1 loose sphere (4.5-5.0mm) - Multiple purchase discounts available Sale price¥5,980

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

《Limited to 2 Stones》Brown Diamond (4mm/0.3ct, with Certificate of Authenticity)《Multiple Purchase Discount Available》 Sale price¥5,980

Sri Lankan Yellow Sapphire 0.517ct Loose Gemstone Sale price¥12,800

1.758 ct Ruby Loose Stone from Vietnam with Identification Report Sale price¥49,800

Natural Emerald from Brazil, 15.219 ct, Loose Stone, Nichidoku Identification Report Sale price¥398,000

[Option] Laser engraving of characters and symbols Sale price¥5,000

イエローダイヤモンド 0.188ctルース(FANCY INTENSE YELLOW, VS1)

Yellow diamond 0.188ct loose (FANCY INTENSE YELLOW, VS1) Sale price¥47,800

Mozambique Ruby 0.544ct Loose Stone with Certificate of Authenticity Sale price¥39,800

Limited to 6 stones: 1 loose unheated Sri Lankan sapphire with silk inclusions (average 0.31 carats) Multiple purchase discounts available Sale price¥4,980

Opal 0.123ct loose stone Sale price¥5,980

Limited to 7 stones: 1 loose Australian boulder opal (average 25 carats) Multiple purchase discounts available Sale price¥8,800

Limited to 12 stones Tanzanian Milky Opal Cat's Eye (7.5 x 5.5 mm) Multiple purchase discounts available Sale price¥3,980

Mexican Hyalite Opal 2.592ct loose Sale price¥9,800

Pt900 ビルマ産ルビー 1.07ct・ダイヤモンド0.32ctリング GIA

[22602674 Listed] [Karafuri] Pt900 Burma Ruby 1.07ct Ring Sale price¥258,000

[On Sale August 6, 10 PM] [Colori] K18 Blue Sapphire 1.13ct / Diamond 0.75ct Ring with Appraisal Report Sale price¥188,000

[On sale at 10 PM on August 6] [Karafuri] Pt850 Ruby 0.85ct, Diamond 0.09ct Ring with Appraisal Certificate Sale price¥79,800

Colombian Pyrite, Mica in Emerald 1.192ct Loose Stone with Certificate Sale price¥79,800

コロンビア産パイライト・雲母インエメラルド 4.8mm/0.360ctルース鑑別書

[Sale on 8/6 at 10 PM JST] Colombian Pyrite and Mica in Emerald, 4.8mm/0.360ct, Loose Stone with Certificate Sale price¥29,800

[On sale August 1, 10 PM] Colombian Cosquez Trapiche Emerald 0.252ct Loose Stone with Certificate Sale price¥35,800

[On sale August 1, 10 PM JST] Colombian Cosquez Trapiche Emerald, 0.231 ct, Loose Stone with Certificate Sale price¥33,800

[On sale August 14th at 10 PM] Colombian Cosquez Trapiche Emerald, 0.199ct Loose Stone with Appraisal Sale price¥29,800

[Sales start August 2nd at 10 PM] Madagascar blue sapphire 0.662 ct loose gemstone with a certificate Sale price¥18,800

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.