














Ruby 0.302ct loose stone
Ruby has been loved as a gemstone since ancient times. It is a red corundum. Ruby has a hardness of 9, which is the second hardest gemstone after diamond, and it is tough, stable, and easy to handle. This is a ruby cut by Sanjay, a Sri Lankan cutter.
Type: Loose (natural stone)
・Stone name: Ruby
Weight: 0.302ct
・Size: 3.5×3.5mm
・Shape: Cushion cut
・Scratches/chips: S
Inclusions: A+
Note: Heating is in progress.
*Ruby is generally a gemstone that has been heated.
・Accessories: Caratz quality guarantee, loose case (if it does not fit, a clear zip case)
▷We accept jewelry processing.If you would like to have your jewelry processed, please order along with the frame of your choice from the link below.
・[Select by stone] Simple order
・[Select by stone] Semi-custom
*If you would like an image of the stone in the frame, would like to discuss a full order, or have any other concerns or questions, please feel free to contact us here .
*Raw stones are not available. There are also some stones that cannot be handled.
*We try to make the colors in the photos as close as possible to the actual product, but they may look slightly different from the actual product depending on the lighting conditions at the time of shooting and the monitor environment you are using. Also, some photos may have been taken using a penlight.
*For information on scratches, chips, treatments, and inclusions, please click here .
*For other frequently asked questions, please click here .
karatz_item_id: 12556978
Choose options






![[On sale 8/12, 10 PM] "Limited to 10 stones" Strong Fire Gem Gacha featuring 3mm Benitoite and Blue Zircon, normally 42,800 yen (multiple purchase discount available)](http://store.karatz.jp/cdn/shop/files/collage_278d67ff-f62b-4a8b-9e44-16602ef86502.png?v=1786093945&width=2000)
![[On sale August 12th at 10 PM] "Limited to 15 Stones" Diamond Gacha featuring rare butterfly-cut diamonds "Multiple Purchase Discount Available"](http://store.karatz.jp/cdn/shop/files/2026-08-0717.06.55.png?v=1786090036&width=1279)
![[12564014 listed] Madagascar Royal Blue Sapphire 0.559ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7313635_14e21f9a-c659-4e26-98cc-121a6a6526df.jpg?v=1786405650&width=3004)
![[Listed as 12563592] Red Coral 0.908ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P1010942_0ddc060b-5571-4bb3-82db-903a0f6846f0.jpg?v=1784777741&width=4000)
![[Published as 12564055] American Red Beryl 0.239ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P8061727_7397d8ee-50f1-4d18-895f-81834f48bc37.jpg?v=1786405834&width=3165)
![[Published as 12564054] Kochi Prefecture Coral 8.132ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P8061786_dbfd5e49-ee7b-485a-84a1-e71f7aec96c4.jpg?v=1786406143&width=3463)

![[Posted on 12563959] Madagascar Padparadscha Sapphire 0.164ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7241965_cec751e0-3766-4ff6-a740-715fc57f7e8e.jpg?v=1786398430&width=2936)
![[12563912 listed] Colombian Pyrite and Mica in Emerald 0.500ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P7290484.jpg?v=1785318021&width=4000)



![[#202607 Akihabara Pop-up Store - Currently out on loan] [Listed as 12563392] Tanzanian Red Spinel 0.291ct Loose Stone](http://store.karatz.jp/cdn/shop/files/P6258339_9ab76656-a3f6-484b-99d4-5a2c0a9869bd.jpg?v=1786348136&width=3175)












![[Jeweler's tools] 4-piece set including loupe (10x magnification), tweezers, and 2 loose stones](http://store.karatz.jp/cdn/shop/files/P4130575.jpg?v=1776126091&width=4000)