# Roto Grip Perfect Gem

> Bowling ball — data from CarryDown (https://www.carrydown.com/balls/roto-grip-perfect-gem/)

- Brand: Roto Grip
- Last updated: 2026-09-14
- Availability: current
- Released/approved: 2026-10-02
- Coverstock: [ER1 Solid](https://www.carrydown.com/brands/roto-grip/coverstocks/er1/) (solid)
- Core: [Gem AI](https://www.carrydown.com/brands/roto-grip/cores/gem-ai/) (asymmetric)
- Intended condition: Heavy oil
- Factory finish: 2000 Grit
- Flare potential: High
- List price (MSRP): no manufacturer price found
- USBC approved: yes (2026-09-08)

## Specs by weight

| Weight | RG | Differential | Int. Diff |
|---|---|---|---|
| 16 lb | 2.49 | 0.055 | 0.017 |
| 15 lb | 2.49 | 0.057 | 0.017 |
| 14 lb | 2.52 | 0.056 | 0.016 |
| 13 lb | 2.57 | 0.032 | 0.01 |
| 12 lb | 2.59 | 0.029 | 0.008 |

## Description

The Perfect GEM: Precision Meets PowerThe legend has evolved. We took the undisputed heavy-hitter of the GEM series and pushed it through our advanced A.I. Core Technology lab to create a ball that doesn’t just hook—it strikes with surgical intent. By strategically refining the core density, we’ve unlocked a new motion profile that retains the raw strength of the original while offering a cleaner look through the front of the lane and a more aggressive finish at the pins.

## Where to buy

- BowlerX (16 lb) — $199.95: https://www.bowlerx.com/roto-grip-perfect-gem-bowling-ball/?attribute_pa_weight=16lb
- BowlerX (15 lb) — $199.95: https://www.bowlerx.com/roto-grip-perfect-gem-bowling-ball/?attribute_pa_weight=15lb
- BowlerX (14 lb) — $199.95: https://www.bowlerx.com/roto-grip-perfect-gem-bowling-ball/?attribute_pa_weight=14lb
- BowlerX (13 lb) — $199.95: https://www.bowlerx.com/roto-grip-perfect-gem-bowling-ball/?attribute_pa_weight=13lb
- BowlerX (12 lb) — $199.95: https://www.bowlerx.com/roto-grip-perfect-gem-bowling-ball/?attribute_pa_weight=12lb
- Bowling.com (16 lb) — $199.95: https://www.bowling.com/products/roto-grip-perfect-gem.htm
- Bowling.com (15 lb) — $199.95: https://www.bowling.com/products/roto-grip-perfect-gem.htm
- Bowling.com (14 lb) — $199.95: https://www.bowling.com/products/roto-grip-perfect-gem.htm
- Bowling.com (13 lb) — $199.95: https://www.bowling.com/products/roto-grip-perfect-gem.htm
- Bowling.com (12 lb) — $199.95: https://www.bowling.com/products/roto-grip-perfect-gem.htm