This article explains how to use and obtain Diamonds in Knives Out. It also covers how to get Diamond discount coupons and whether Diamonds can be exchanged for Gold Vouchers. Please use this guide when using Diamonds in Knives Out.
Table of Contents
How to Use Diamonds
Summary of How to Use Diamonds
- Purchase Outfit Skins
- Purchase Weapon Skins
- Purchase Advanced Supplies (Gacha)
- Purchase Items (Treasures)
Purchase Outfit Skins

Outfit skins can be purchased from the Shop under Outfits. Be aware that some skins cannot be bought with Diamonds and can only be purchased with Silver Coins or Gold Vouchers.
Purchase Weapon Skins

Weapon skins can be purchased from the Shop under Weapons. Many skins can only be bought with Gold Vouchers, but some can also be purchased with Diamonds or Silver Coins, so be sure to check.
Purchase Advanced Supplies (Gacha)

In Knives Out, there is a gacha system called Supplies. Advanced Supplies contain rare and valuable skins. It costs 600 Diamonds to open Advanced Supplies.
Main Contents of Advanced Supplies
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Purchase Items (Treasures)

Items like 2x EXP cards, gender change cards, and clan name change cards can be purchased from the shop. It's recommended to buy EXP cards when you want to level up efficiently.
Walkie-Talkies Can Also Be Purchased

If you run out of walkie-talkies for speaking in the lobby, you can buy them for 50 Diamonds. There have also been events where you could get rewards by announcing a redemption code, so it's a good idea to purchase some in advance.
How to Obtain Diamonds
List of Ways to Obtain Diamonds
How to Obtain | Recommendation Level |
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Daily Missions | ★★★★★ |
Clan Missions | ★★★★★ |
Exchange with Friends | ★★★★★ |
Monthly Login Bonus | ★★★★★ |
Purchase Weekly/Monthly Pass | ★★★★・ |
Events | ★★★★・ |
Season Rank Up Rewards | ★★★★・ |
Level Up Rewards | ★★★★・ |
Squad Missions | ★★★・・ |
Mentor Level Bonus | ★★★・・ |
Battle Pass Rewards | ★★・・・ |
Exchange with Gold Vouchers | ★・・・・ |
Obtain Diamonds from Daily Missions!

You can obtain Diamonds by completing Daily Missions and Weekly Missions. You can challenge them daily and weekly, so complete the missions diligently.
Obtain Diamonds from Clan Missions

Daily | Diamonds x110 |
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Weekly | Diamonds x300 |
By joining a clan, you can participate in Clan Missions. Various missions are updated daily, and by completing Clan Missions, you can obtain not only Diamonds but also a wealth of useful items.
Exchange with Friends

Per person per day | Diamonds x20 |
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Without consuming your own Diamonds, you can exchange Diamonds x20 with friends daily. The more friends you have, the more likely you are to obtain Diamonds, so try to make friends with many players.
Get Diamonds from Monthly Login Bonus!

Monthly | Diamonds x500 |
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You can obtain login bonuses just by logging into the game. Various rewards are set for each date, and you can get Diamonds by logging in for a specified number of days.
Get Diamonds Daily with Weekly/Monthly Pass Bonus

Daily | Regular: Diamonds x100 Deluxe: Diamonds x200 |
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Although it's a paid feature, by purchasing a Weekly/Monthly Pass, you can obtain Diamonds daily. You might also get extra Diamonds as a weekend bonus or immediately after purchase. Players who want to do gacha or collect skins should consider purchasing it.
Obtain Diamonds from Events

Irregular | Diamonds x0-10000 |
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You can obtain Diamonds with high probability from original events held irregularly or collaboration events. This is a chance to get a large amount of Diamonds in a short period, so be sure to check for ongoing events!
Obtain from Season Rank Up Rewards

Reach Max Rank | Diamonds x26000 |
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Each time your season rank increases, you can obtain rewards such as Diamonds and Competition Coins. You can raise your rank in normal battles and some leisure modes, so practice and aim for a rank up!
Obtain Diamonds from Level Up Rewards

Max Obtainable Reward | Diamonds x46630 |
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You are guaranteed to receive Diamonds as level up rewards. The amount of Diamonds you receive increases as your level goes up, so complete drills and missions to raise your level.
Obtain Diamonds from Squad Missions

Daily | Unspecified amount |
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By joining a squad, you can participate in Squad Missions. One Squad Mission is updated daily, and the mission content and rewards differ each day.
Obtain Diamonds by Raising Mentor Level

Max Obtainable Reward | Diamonds x10000 |
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To become a mentor, you first need to take on an apprentice. By completing missions with your apprentice player and raising your mentor level, you can obtain a large amount of Diamonds.
Obtain Diamonds from Battle Pass Rewards

Elite Version | Diamonds x2000 |
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By purchasing the Elite version of the Battle Pass, you can obtain Diamonds upon reaching specified levels. There are also many other luxurious rewards besides Diamonds, so consider purchasing it.
Exchange with Gold Vouchers

Gold Vouchers, which can be charged through in-app purchases, can be exchanged for Diamonds. You can exchange 1 Gold Voucher for 10 Diamonds, so if you are thinking of purchasing gacha or skins with Diamonds and have Gold Vouchers, you should try exchanging them.
How to Obtain Diamond Discount Coupons
Obtain with Gift Value

Diamond discount coupons can be obtained in exchange for Gift Value. Using a Diamond discount coupon allows you to purchase Diamonds at a discount.
Can Diamonds Be Exchanged for Gold Vouchers?
Diamonds Cannot Be Exchanged for Gold Vouchers
Currently, there is no way to obtain Gold Vouchers using Diamonds. However, Bound Gold Vouchers have been obtainable through events in the past, so there may be opportunities to get them without paying in the future.