The Thames & Kosmos Rock Tumbler Refill Pack

Name: The Thames & Kosmos Rock Tumbler Refill Pack
Brand: Thames & Kosmos
SKU: 210000074751
Price: 15.99 USD
Availability: InStock
Rating: 5.0 (5 reviews)

The Thames & Kosmos Rock Tumbler Refill Pack - Main image

The Thames & Kosmos Rock Tumbler Refill Pack - View 2

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$15.99 In stock

Category: 8-10 Years

Keep on rockin’ and rollin’ with this refill pack for the Thames & Kosmos Rock Tumbler. This pack includes a one-pound assortment of natural rock samples — including tiger’s eye, aventurine, rose quartz, and more — as well as four polishing grits. Use the included jewelry settings to create accessories from your specimens.

From Thames & Kosmos, for ages 8 and up

Product Details

Ages: 8+
Piece Count: 10
Product Dimensions: 4.5 x 9.6 x 2 in.
Product Weight: 1.3 lbs.
Batteries Required: N/A
Country of Origin: China
Year Released: 2025

Customer Reviews (5.0 / 5 · 5 reviews)

Victoria ★★★★★ Sep 3, 2026

The one-pound bag has plenty of rocks to get another full cycle going, and my kid was thrilled to spot the tiger’s eye right away. The mix feels like real variety, not just filler.

Hazel J. ★★★★★ Sep 2, 2026

My daughter finished her first batch and immediately asked for more rocks, so this refill was perfect timing. The mix has a nice variety of textures and colors, and the tiger’s eye pieces polished up really nicely after a couple weeks in the tumbler.

Alexander ★★★★★ Sep 1, 2026

The one-pound bag of tiger’s eye and rose quartz was a hit—my son sorted through every single piece before we even loaded the tumbler. The variety feels generous for the price, and the rocks came out nicely polished after a couple weeks.